2, 3, 5, 7, 11, 13, 17, 19...

Prime-Numbers.net

Where Prime Numbers mysteries are solved.

Prime Numbers 1-20 Chart

Here's a chart with all the numbers from 1-20:

Show only primes  Show only composites  Show all

Number Is it Prime? Explanation
1 No 1 is neither prime nor composite. It's a special number.
2 Yes 2 is divisible by itself and 1.
3 Yes 3 is divisible by itself and 1.
4 No 4 is divisible by 2, so it's not prime.
5 Yes 5 is divisible by itself and 1.
6 No 6 is divisible by 2 and 3, so it's not prime.
7 Yes 7 is divisible by itself and 1.
8 No 8 is divisible by 2, so it's not prime.
9 No 9 is divisible by 3, so it's not prime.
10 No 10 is divisible by 2 and 5, so it's not prime.
11 Yes 11 is divisible by itself and 1.
12 No 12 is divisible by 2 and 3, so it's not prime.
13 Yes 13 is divisible by itself and 1.
14 No 14 is divisible by 2 and 7, so it's not prime.
15 No 15 is divisible by 3 and 5, so it's not prime.
16 No 16 is divisible by 2, so it's not prime.
17 Yes 17 is divisible by itself and 1.
18 No 18 is divisible by 2 and 3, so it's not prime.
19 Yes 19 is divisible by itself and 1.
20 No 20 is divisible by 2 and 5, so it's not prime.