1. 121的質(zhì)數(shù)有哪些數(shù)
答：121的公因數(shù)有1、11、121。
解答解答：
121的質(zhì)因數(shù)分解是121＝11×11，
所以，121的因數(shù)有1、11、121。
知識點拓展：
因數(shù)的性質(zhì)是：若整數(shù)a除以非零整數(shù)b，商為整數(shù)，且余數(shù)為零，a能被b整除，或b能整除a，記作b|a；質(zhì)數(shù)是恰好有兩個正因數(shù)的自然數(shù)；合數(shù)是除了1和本身還有其它正因數(shù)；1只有正因數(shù)1，所以既不是質(zhì)數(shù)也不是合數(shù)；若a是b的因數(shù)，且a是質(zhì)數(shù)，則稱a是b的質(zhì)因數(shù)；公因數(shù)只有1的兩個非零自然數(shù),叫做互質(zhì)數(shù)；
2. 1211是質(zhì)數(shù)嗎
10000以內(nèi)：
a(169)=1009:a(170)=1013
a(171)=1019:a(172)=1021:a(173)=1031:a(174)=1033:a(175)=1039:a(176)=1049:a(177)=1051:a(178)=1061:a(179)=1063:a(180)=1069
a(181)=1087:a(182)=1091:a(183)=1093:a(184)=1097:a(185)=1103:a(186)=1109:a(187)=1117:a(188)=1123:a(189)=1129:a(190)=1151
a(191)=1153:a(192)=1163:a(193)=1171:a(194)=1181:a(195)=1187:a(196)=1193:a(197)=1201:a(198)=1213:a(199)=1217:a(200)=1223
a(201)=1229:a(202)=1231:a(203)=1237:a(204)=1249:a(205)=1259:a(206)=1277:a(207)=1279:a(208)=1283:a(209)=1289:a(210)=1291
a(211)=1297:a(212)=1301:a(213)=1303:a(214)=1307:a(215)=1319:a(216)=1321:a(217)=1327:a(218)=1361:a(219)=1367:a(220)=1373
a(221)=1381:a(222)=1399:a(223)=1409:a(224)=1423:a(225)=1427:a(226)=1429:a(227)=1433:a(228)=1439:a(229)=1447:a(230)=1451
a(231)=1453:a(232)=1459:a(233)=1471:a(234)=1481:a(235)=1483:a(236)=1487:a(237)=1489:a(238)=1493:a(239)=1499:a(240)=1511
a(241)=1523:a(242)=1531:a(243)=1543:a(244)=1549:a(245)=1553:a(246)=1559:a(247)=1567:a(248)=1571:a(249)=1579:a(250)=1583
a(251)=1597:a(252)=1601:a(253)=1607:a(254)=1609:a(255)=1613:a(256)=1619:a(257)=1621:a(258)=1627:a(259)=1637:a(260)=1657
a(261)=1663:a(262)=1667:a(263)=1669:a(264)=1693:a(265)=1697:a(266)=1699:a(267)=1709:a(268)=1721:a(269)=1723:a(270)=1733
a(271)=1741:a(272)=1747:a(273)=1753:a(274)=1759:a(275)=1777:a(276)=1783:a(277)=1787:a(278)=1789:a(279)=1801:a(280)=1811
a(281)=1823:a(282)=1831:a(283)=1847:a(284)=1861:a(285)=1867:a(286)=1871:a(287)=1873:a(288)=1877:a(289)=1879:a(290)=1889
a(291)=1901:a(292)=1907:a(293)=1913:a(294)=1931:a(295)=1933:a(296)=1949:a(297)=1951:a(298)=1973:a(299)=1979:a(300)=1987
a(301)=1993:a(302)=1997:a(303)=1999:a(304)=2003:a(305)=2011:a(306)=2017:a(307)=2027:a(308)=2029:a(309)=2039:a(310)=2053
a(311)=2063:a(312)=2069:a(313)=2081:a(314)=2083:a(315)=2087:a(316)=2089:a(317)=2099:a(318)=2111:a(319)=2113:a(320)=2129
a(321)=2131:a(322)=2137:a(323)=2141:a(324)=2143:a(325)=2153:a(326)=2161:a(327)=2179:a(328)=2203:a(329)=2207:a(330)=2213
a(331)=2221:a(332)=2237:a(333)=2239:a(334)=2243:a(335)=2251:a(336)=2267:a(337)=2269:a(338)=2273:a(339)=2281:a(340)=2287
a(341)=2293:a(342)=2297:a(343)=2309:a(344)=2311:a(345)=2333:a(346)=2339:a(347)=2341:a(348)=2347:a(349)=2351:a(350)=2357
a(351)=2371:a(352)=2377:a(353)=2381:a(354)=2383:a(355)=2389:a(356)=2393:a(357)=2399:a(358)=2411:a(359)=2417:a(360)=2423
a(361)=2437:a(362)=2441:a(363)=2447:a(364)=2459:a(365)=2467:a(366)=2473:a(367)=2477:a(368)=2503:a(369)=2521:a(370)=2531
a(371)=2539:a(372)=2543:a(373)=2549:a(374)=2551:a(375)=2557:a(376)=2579:a(377)=2591:a(378)=2593:a(379)=2609:a(380)=2617
a(381)=2621:a(382)=2633:a(383)=2647:a(384)=2657:a(385)=2659:a(386)=2663:a(387)=2671:a(388)=2677:a(389)=2683:a(390)=2687
a(391)=2689:a(392)=2693:a(393)=2699:a(394)=2707:a(395)=2711:a(396)=2713:a(397)=2719:a(398)=2729:a(399)=2731:a(400)=2741
a(401)=2749:a(402)=2753:a(403)=2767:a(404)=2777:a(405)=2789:a(406)=2791:a(407)=2797:a(408)=2801:a(409)=2803:a(410)=2819
a(411)=2833:a(412)=2837:a(413)=2843:a(414)=2851:a(415)=2857:a(416)=2861:a(417)=2879:a(418)=2887:a(419)=2897:a(420)=2903
a(421)=2909:a(422)=2917:a(423)=2927:a(424)=2939:a(425)=2953:a(426)=2957:a(427)=2963:a(428)=2969:a(429)=2971:a(430)=2999
a(431)=3001:a(432)=3011:a(433)=3019:a(434)=3023:a(435)=3037:a(436)=3041:a(437)=3049:a(438)=3061:a(439)=3067:a(440)=3079
a(441)=3083:a(442)=3089:a(443)=3109:a(444)=3119:a(445)=3121:a(446)=3137:a(447)=3163:a(448)=3167:a(449)=3169:a(450)=3181
a(451)=3187:a(452)=3191:a(453)=3203:a(454)=3209:a(455)=3217:a(456)=3221:a(457)=3229:a(458)=3251:a(459)=3253:a(460)=3257
a(461)=3259:a(462)=3271:a(463)=3299:a(464)=3301:a(465)=3307:a(466)=3313:a(467)=3319:a(468)=3323:a(469)=3329:a(470)=3331
a(471)=3343:a(472)=3347:a(473)=3359:a(474)=3361:a(475)=3371:a(476)=3373:a(477)=3389:a(478)=3391:a(479)=3407:a(480)=3413
a(481)=3433:a(482)=3449:a(483)=3457:a(484)=3461:a(485)=3463:a(486)=3467:a(487)=3469:a(488)=3491:a(489)=3499:a(490)=3511
a(491)=3517:a(492)=3527:a(493)=3529:a(494)=3533:a(495)=3539:a(496)=3541:a(497)=3547:a(498)=3557:a(499)=3559:a(500)=3571
a(501)=3581:a(502)=3583:a(503)=3593:a(504)=3607:a(505)=3613:a(506)=3617:a(507)=3623:a(508)=3631:a(509)=3637:a(510)=3643
a(511)=3659:a(512)=3671:a(513)=3673:a(514)=3677:a(515)=3691:a(516)=3697:a(517)=3701:a(518)=3709:a(519)=3719:a(520)=3727
a(521)=3733:a(522)=3739:a(523)=3761:a(524)=3767:a(525)=3769:a(526)=3779:a(527)=3793:a(528)=3797:a(529)=3803:a(530)=3821
a(531)=3823:a(532)=3833:a(533)=3847:a(534)=3851:a(535)=3853:a(536)=3863:a(537)=3877:a(538)=3881:a(539)=3889:a(540)=3907
a(541)=3911:a(542)=3917:a(543)=3919:a(544)=3923:a(545)=3929:a(546)=3931:a(547)=3943:a(548)=3947:a(549)=3967:a(550)=3989
a(551)=4001:a(552)=4003:a(553)=4007:a(554)=4013:a(555)=4019:a(556)=4021:a(557)=4027:a(558)=4049:a(559)=4051:a(560)=4057
a(561)=4073:a(562)=4079:a(563)=4091:a(564)=4093:a(565)=4099:a(566)=4111:a(567)=4127:a(568)=4129:a(569)=4133:a(570)=4139
a(571)=4153:a(572)=4157:a(573)=4159:a(574)=4177:a(575)=4201:a(576)=4211:a(577)=4217:a(578)=4219:a(579)=4229:a(580)=4231
a(581)=4241:a(582)=4243:a(583)=4253:a(584)=4259:a(585)=4261:a(586)=4271:a(587)=4273:a(588)=4283:a(589)=4289:a(590)=4297
a(591)=4327:a(592)=4337:a(593)=4339:a(594)=4349:a(595)=4357:a(596)=4363:a(597)=4373:a(598)=4391:a(599)=4397:a(600)=4409
a(601)=4421:a(602)=4423:a(603)=4441:a(604)=4447:a(605)=4451:a(606)=4457:a(607)=4463:a(608)=4481:a(609)=4483:a(610)=4493
a(611)=4507:a(612)=4513:a(613)=4517:a(614)=4519:a(615)=4523:a(616)=4547:a(617)=4549:a(618)=4561:a(619)=4567:a(620)=4583
a(621)=4591:a(622)=4597:a(623)=4603:a(624)=4621:a(625)=4637:a(626)=4639:a(627)=4643:a(628)=4649:a(629)=4651:a(630)=4657
a(631)=4663:a(632)=4673:a(633)=4679:a(634)=4691:a(635)=4703:a(636)=4721:a(637)=4723:a(638)=4729:a(639)=4733:a(640)=4751
a(641)=4759:a(642)=4783:a(643)=4787:a(644)=4789:a(645)=4793:a(646)=4799:a(647)=4801:a(648)=4813:a(649)=4817:a(650)=4831
a(651)=4861:a(652)=4871:a(653)=4877:a(654)=4889:a(655)=4903:a(656)=4909:a(657)=4919:a(658)=4931:a(659)=4933:a(660)=4937
a(661)=4943:a(662)=4951:a(663)=4957:a(664)=4967:a(665)=4969:a(666)=4973:a(667)=4987:a(668)=4993:a(669)=4999:a(670)=5003
a(671)=5009:a(672)=5011:a(673)=5021:a(674)=5023:a(675)=5039:a(676)=5051:a(677)=5059:a(678)=5077:a(679)=5081:a(680)=5087
a(681)=5099:a(682)=5101:a(683)=5107:a(684)=5113:a(685)=5119:a(686)=5147:a(687)=5153:a(688)=5167:a(689)=5171:a(690)=5179
a(691)=5189:a(692)=5197:a(693)=5209:a(694)=5227:a(695)=5231:a(696)=5233:a(697)=5237:a(698)=5261:a(699)=5273:a(700)=5279
a(701)=5281:a(702)=5297:a(703)=5303:a(704)=5309:a(705)=5323:a(706)=5333:a(707)=5347:a(708)=5351:a(709)=5381:a(710)=5387
a(711)=5393:a(712)=5399:a(713)=5407:a(714)=5413:a(715)=5417:a(716)=5419:a(717)=5431:a(718)=5437:a(719)=5441:a(720)=5443
a(721)=5449:a(722)=5471:a(723)=5477:a(724)=5479:a(725)=5483:a(726)=5501:a(727)=5503:a(728)=5507:a(729)=5519:a(730)=5521
a(731)=5527:a(732)=5531:a(733)=5557:a(734)=5563:a(735)=5569:a(736)=5573:a(737)=5581:a(738)=5591:a(739)=5623:a(740)=5639
a(741)=5641:a(742)=5647:a(743)=5651:a(744)=5653:a(745)=5657:a(746)=5659:a(747)=5669:a(748)=5683:a(749)=5689:a(750)=5693
a(751)=5701:a(752)=5711:a(753)=5717:a(754)=5737:a(755)=5741:a(756)=5743:a(757)=5749:a(758)=5779:a(759)=5783:a(760)=5791
a(761)=5801:a(762)=5807:a(763)=5813:a(764)=5821:a(765)=5827:a(766)=5839:a(767)=5843:a(768)=5849:a(769)=5851:a(770)=5857
a(771)=5861:a(772)=5867:a(773)=5869:a(774)=5879:a(775)=5881:a(776)=5897:a(777)=5903:a(778)=5923:a(779)=5927:a(780)=5939
a(781)=5953:a(782)=5981:a(783)=5987:a(784)=6007:a(785)=6011:a(786)=6029:a(787)=6037:a(788)=6043:a(789)=6047:a(790)=6053
a(791)=6067:a(792)=6073:a(793)=6079:a(794)=6089:a(795)=6091:a(796)=6101:a(797)=6113:a(798)=6121:a(799)=6131:a(800)=6133
a(801)=6143:a(802)=6151:a(803)=6163:a(804)=6173:a(805)=6197:a(806)=6199:a(807)=6203:a(808)=6211:a(809)=6217:a(810)=6221
a(811)=6229:a(812)=6247:a(813)=6257:a(814)=6263:a(815)=6269:a(816)=6271:a(817)=6277:a(818)=6287:a(819)=6299:a(820)=6301
a(821)=6311:a(822)=6317:a(823)=6323:a(824)=6329:a(825)=6337:a(826)=6343:a(827)=6353:a(828)=6359:a(829)=6361:a(830)=6367
a(831)=6373:a(832)=6379:a(833)=6389:a(834)=6397:a(835)=6421:a(836)=6427:a(837)=6449:a(838)=6451:a(839)=6469:a(840)=6473
a(841)=6481:a(842)=6491:a(843)=6521:a(844)=6529:a(845)=6547:a(846)=6551:a(847)=6553:a(848)=6563:a(849)=6569:a(850)=6571
a(851)=6577:a(852)=6581:a(853)=6599:a(854)=6607:a(855)=6619:a(856)=6637:a(857)=6653:a(858)=6659:a(859)=6661:a(860)=6673
a(861)=6679:a(862)=6689:a(863)=6691:a(864)=6701:a(865)=6703:a(866)=6709:a(867)=6719:a(868)=6733:a(869)=6737:a(870)=6761
a(871)=6763:a(872)=6779:a(873)=6781:a(874)=6791:a(875)=6793:a(876)=6803:a(877)=6823:a(878)=6827:a(879)=6829:a(880)=6833
a(881)=6841:a(882)=6857:a(883)=6863:a(884)=6869:a(885)=6871:a(886)=6883:a(887)=6899:a(888)=6907:a(889)=6911:a(890)=6917
a(891)=6947:a(892)=6949:a(893)=6959:a(894)=6961:a(895)=6967:a(896)=6971:a(897)=6977:a(898)=6983:a(899)=6991:a(900)=6997
a(901)=7001:a(902)=7013:a(903)=7019:a(904)=7027:a(905)=7039:a(906)=7043:a(907)=7057:a(908)=7069:a(909)=7079:a(910)=7103
a(911)=7109:a(912)=7121:a(913)=7127:a(914)=7129:a(915)=7151:a(916)=7159:a(917)=7177:a(918)=7187:a(919)=7193:a(920)=7207
a(921)=7211:a(922)=7213:a(923)=7219:a(924)=7229:a(925)=7237:a(926)=7243:a(927)=7247:a(928)=7253:a(929)=7283:a(930)=7297
a(931)=7307:a(932)=7309:a(933)=7321:a(934)=7331:a(935)=7333:a(936)=7349:a(937)=7351:a(938)=7369:a(939)=7393:a(940)=7411
a(941)=7417:a(942)=7433:a(943)=7451:a(944)=7457:a(945)=7459:a(946)=7477:a(947)=7481:a(948)=7487:a(949)=7489:a(950)=7499
a(951)=7507:a(952)=7517:a(953)=7523:a(954)=7529:a(955)=7537:a(956)=7541:a(957)=7547:a(958)=7549:a(959)=7559:a(960)=7561
a(961)=7573:a(962)=7577:a(963)=7583:a(964)=7589:a(965)=7591:a(966)=7603:a(967)=7607:a(968)=7621:a(969)=7639:a(970)=7643
a(971)=7649:a(972)=7669:a(973)=7673:a(974)=7681:a(975)=7687:a(976)=7691:a(977)=7699:a(978)=7703:a(979)=7717:a(980)=7723
a(981)=7727:a(982)=7741:a(983)=7753:a(984)=7757:a(985)=7759:a(986)=7789:a(987)=7793:a(988)=7817:a(989)=7823:a(990)=7829
a(991)=7841:a(992)=7853:a(993)=7867:a(994)=7873:a(995)=7877:a(996)=7879:a(997)=7883:a(998)=7901:a(999)=7907:a(1000)=7919
a(1001)=7927:a(1002)=7933:a(1003)=7937:a(1004)=7949:a(1005)=7951:a(1006)=7963:a(1007)=7993:a(1008)=8009:a(1009)=8011:a(1010)=8017
a(1011)=8039:a(1012)=8053:a(1013)=8059:a(1014)=8069:a(1015)=8081:a(1016)=8087:a(1017)=8089:a(1018)=8093:a(1019)=8101:a(1020)=8111
a(1021)=8117:a(1022)=8123:a(1023)=8147:a(1024)=8161:a(1025)=8167:a(1026)=8171:a(1027)=8179:a(1028)=8191:a(1029)=8209:a(1030)=8219
a(1031)=8221:a(1032)=8231:a(1033)=8233:a(1034)=8237:a(1035)=8243:a(1036)=8263:a(1037)=8269:a(1038)=8273:a(1039)=8287:a(1040)=8291
a(1041)=8293:a(1042)=8297:a(1043)=8311:a(1044)=8317:a(1045)=8329:a(1046)=8353:a(1047)=8363:a(1048)=8369:a(1049)=8377:a(1050)=8387
a(1051)=8389:a(1052)=8419:a(1053)=8423:a(1054)=8429:a(1055)=8431:a(1056)=8443:a(1057)=8447:a(1058)=8461:a(1059)=8467:a(1060)=8501
a(1061)=8513:a(1062)=8521:a(1063)=8527:a(1064)=8537:a(1065)=8539:a(1066)=8543:a(1067)=8563:a(1068)=8573:a(1069)=8581:a(1070)=8597
a(1071)=8599:a(1072)=8609:a(1073)=8623:a(1074)=8627:a(1075)=8629:a(1076)=8641:a(1077)=8647:a(1078)=8663:a(1079)=8669:a(1080)=8677
a(1081)=8681:a(1082)=8689:a(1083)=8693:a(1084)=8699:a(1085)=8707:a(1086)=8713:a(1087)=8719:a(1088)=8731:a(1089)=8737:a(1090)=8741
a(1091)=8747:a(1092)=8753:a(1093)=8761:a(1094)=8779:a(1095)=8783:a(1096)=8803:a(1097)=8807:a(1098)=8819:a(1099)=8821:a(1100)=8831
a(1101)=8837:a(1102)=8839:a(1103)=8849:a(1104)=8861:a(1105)=8863:a(1106)=8867:a(1107)=8887:a(1108)=8893:a(1109)=8923:a(1110)=8929
a(1111)=8933:a(1112)=8941:a(1113)=8951:a(1114)=8963:a(1115)=8969:a(1116)=8971:a(1117)=8999:a(1118)=9001:a(1119)=9007:a(1120)=9011
a(1121)=9013:a(1122)=9029:a(1123)=9041:a(1124)=9043:a(1125)=9049:a(1126)=9059:a(1127)=9067:a(1128)=9091:a(1129)=9103:a(1130)=9109
a(1131)=9127:a(1132)=9133:a(1133)=9137:a(1134)=9151:a(1135)=9157:a(1136)=9161:a(1137)=9173:a(1138)=9181:a(1139)=9187:a(1140)=9199
a(1141)=9203:a(1142)=9209:a(1143)=9221:a(1144)=9227:a(1145)=9239:a(1146)=9241:a(1147)=9257:a(1148)=9277:a(1149)=9281:a(1150)=9283
a(1151)=9293:a(1152)=9311:a(1153)=9319:a(1154)=9323:a(1155)=9337:a(1156)=9341:a(1157)=9343:a(1158)=9349:a(1159)=9371:a(1160)=9377
a(1161)=9391:a(1162)=9397:a(1163)=9403:a(1164)=9413:a(1165)=9419:a(1166)=9421:a(1167)=9431:a(1168)=9433:a(1169)=9437:a(1170)=9439
a(1171)=9461:a(1172)=9463:a(1173)=9467:a(1174)=9473:a(1175)=9479:a(1176)=9491:a(1177)=9497:a(1178)=9511:a(1179)=9521:a(1180)=9533
a(1181)=9539:a(1182)=9547:a(1183)=9551:a(1184)=9587:a(1185)=9601:a(1186)=9613:a(1187)=9619:a(1188)=9623:a(1189)=9629:a(1190)=9631
a(1191)=9643:a(1192)=9649:a(1193)=9661:a(1194)=9677:a(1195)=9679:a(1196)=9689:a(1197)=9697:a(1198)=9719:a(1199)=9721:a(1200)=9733
a(1201)=9739:a(1202)=9743:a(1203)=9749:a(1204)=9767:a(1205)=9769:a(1206)=9781:a(1207)=9787:a(1208)=9791:a(1209)=9803:a(1210)=9811
a(1211)=9817:a(1212)=9829:a(1213)=9833:a(1214)=9839:a(1215)=9851:a(1216)=9857:a(1217)=9859:a(1218)=9871:a(1219)=9883:a(1220)=9887
a(1221)=9901:a(1222)=9907:a(1223)=9923:a(1224)=9929:a(1225)=9931:a(1226)=9941:a(1227)=9949:a(1228)=9967:a(1229)=9973
3. 121-131中有多少個質(zhì)數(shù)
只有一和它本身兩個因數(shù)，就是質(zhì)數(shù)。1既不是質(zhì)數(shù)，也不是合數(shù)，1 到100 的質(zhì)數(shù):2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97
101 到200 的質(zhì)數(shù):101 103 107 109 113 127 131 137 139 149 151 157 163 167 173 179 181 191 193 197 199
201 到300 的質(zhì)數(shù):211 223 227 229 233 239 241 251 257 263 269 271 277 281 283 293
301 到400 的質(zhì)數(shù):307 311 313 317 331 337 347 349 353 359 367 373 379 383 389 397
401 到500 的質(zhì)數(shù):401 409 419 421 431 433 439 443 449 457 461 463 467 479 487 491 499
501 到600 的質(zhì)數(shù):503 509 521 523 541 547 557 563 569 571 577 587 593 599，共有108 個數(shù)。
4. 121的質(zhì)數(shù)有哪些數(shù)字
121=11*11
本題應(yīng)該是一個質(zhì)因數(shù)分解的問題，121他是一個合數(shù)，121=11×11，因為11是質(zhì)數(shù)，所以這一種分解形式就叫做質(zhì)因數(shù)分解，那么11×11就是本題的答案，在數(shù)字較大的時候，質(zhì)數(shù)和合數(shù)并不太好判斷，但是大的數(shù)字有一個規(guī)則就是偶數(shù)，他不用看，他肯定是合數(shù)
5. 121至131質(zhì)數(shù)有幾個
三位數(shù)的質(zhì)數(shù)有：101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173，179, 181, 191, 193, 197, 199，211, 223, 227, 229, 233, 239, 241, 251, 257, 263, 269, 271, 277, 281, 283, 293，307, 311, 313, 317, 331, 337, 347, 349, 353, 359, 367, 373, 379, 383, 389, 397，401, 409, 419, 421, 431, 433, 439, 443, 449, 457, 461, 463, 467, 479, 487, 491，499，503, 509, 521, 523, 541, 547, 557, 563, 569, 571, 577, 587, 593, 599，601, 607, 613, 617, 619, 631, 641, 643, 647, 653, 659, 661, 673, 677, 683, 691，701, 709, 719, 727, 733, 739, 743, 751, 757, 761, 769, 773, 787, 797，809, 811, 821, 823, 827, 829, 839, 853, 857, 859, 863, 877, 881, 883, 887，907, 911, 919, 929, 937, 941, 947, 953, 967, 971, 977, 983, 991, 997
6. 121等于多少乘多少質(zhì)數(shù)
11和121的最小公倍數(shù)是121。
倍數(shù)[bèi shù]
①一個整數(shù)能夠被另一個整數(shù)整除，這個整數(shù)就是另一整數(shù)的倍數(shù)。如15能夠被3或5整除，因此15是3的倍數(shù)，也是5的倍數(shù)。②一個數(shù)除以另一數(shù)所得的商。如a÷b=c，就是說，a是b的倍數(shù)。例如：A÷B=C，就可以說A是B的C倍。③一個數(shù)的倍數(shù)有無數(shù)個，也就是說一個數(shù)的倍數(shù)的集合為無限集。 注意：不能把一個數(shù)單獨叫做倍數(shù)，只能說誰是誰的倍數(shù)。
7. 121的質(zhì)數(shù)有哪些數(shù)字組成
121是一個自然數(shù)數(shù)據(jù)
121（一百二十一）是120與122之間的一個自然數(shù)。它也是奇數(shù)、合數(shù)、平方數(shù)、半素數(shù)。
第90個合數(shù)，正因數(shù)有1、11和121。前一個為120、下一個為122。
? 第91個虧數(shù)，真因數(shù)和為12，虧度為109。前一個為119、下一個為122。
? 第40個半質(zhì)數(shù)。前一個為119、下一個為122。
8. 121以內(nèi)的質(zhì)數(shù)表
121有1個質(zhì)因數(shù)。
質(zhì)因數(shù)的概念：把合數(shù)寫成幾個質(zhì)數(shù)相乘的形式,每個質(zhì)數(shù)都叫作這個合數(shù)的質(zhì)因數(shù)。我們要找一個合數(shù)的質(zhì)因數(shù)，首先可以分解質(zhì)因數(shù)，121＝11×11。所以，121的質(zhì)因數(shù)是11。我們也可以寫出121的所有因數(shù)：1，11，121，從中找出質(zhì)數(shù)11就是121的質(zhì)因數(shù)。
9. 121是質(zhì)數(shù)還是因數(shù)
答：121的質(zhì)因數(shù)兩個11，即121=11x11
本題，實際上就是要考察我們分解質(zhì)因數(shù)的能力。將一個數(shù)分解成質(zhì)因數(shù)的形式，我們一般都是用短除法來進(jìn)行。在分解的時候，都用最小的質(zhì)數(shù)來逐個試除，直至將一個合數(shù)全部分解成質(zhì)數(shù)因數(shù)的乘積。因為121，用2、3、5、7來試除都不行，所以，要用11來試除，則121=11x11。即121的質(zhì)因數(shù)有兩個11。
