Prime numbers from 1 to 1000

There are 168 prime numbers below 1000, the largest being 997; 25 of them are below 100.

Prime numbers from 1 to 1000
Primes #	1	2	3	4	5	6	7	8	9	10
1–10	2	3	5	7	11	13	17	19	23	29
11–20	31	37	41	43	47	53	59	61	67	71
21–30	73	79	83	89	97	101	103	107	109	113
31–40	127	131	137	139	149	151	157	163	167	173
41–50	179	181	191	193	197	199	211	223	227	229
51–60	233	239	241	251	257	263	269	271	277	281
61–70	283	293	307	311	313	317	331	337	347	349
71–80	353	359	367	373	379	383	389	397	401	409
81–90	419	421	431	433	439	443	449	457	461	463
91–100	467	479	487	491	499	503	509	521	523	541
101–110	547	557	563	569	571	577	587	593	599	601
111–120	607	613	617	619	631	641	643	647	653	659
121–130	661	673	677	683	691	701	709	719	727	733
131–140	739	743	751	757	761	769	773	787	797	809
141–150	811	821	823	827	829	839	853	857	859	863
151–160	877	881	883	887	907	911	919	929	937	941
161–168	947	953	967	971	977	983	991	997

Need a value that is not in the table? Open the calculator : Gcd Two Numbers →

How it is computed

The list comes from the sieve of Eratosthenes: starting at 2, every multiple of each prime is crossed out, and the numbers left are prime. Each row holds ten primes in order; the first column gives their rank.

FAQ

Is 1 a prime number?+

No. A prime has exactly two divisors, 1 and itself; 1 has only one. Excluding it keeps every whole number's prime factorization unique.

How do I check whether a number is prime?+

Try dividing it by each prime up to its square root. For a number below 1000 that means primes up to 31; if none divides it, it is prime.