A Prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite. 3, 5, and 7 are all prime.
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Prime numbers are positive integers with only two factors. 2, 3, 5 and 7 are examples of prime numbers.
2, 3 and 5
2 and 3
Some pairs of prime numbers are: 3, 5 11, 17 7, 23
They are: 2 3 5 7 and 11