2, 3 and 5
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Prime numbers are positive integers with only two factors. 2, 3, 5 and 7 are examples of prime numbers.
1 As whole numbers 2 As prime numbers 3 Arithmetical calculations without fractions or decimals
2 and 3
Some pairs of prime numbers are: 3, 5 11, 17 7, 23
The prime factorization for 18 is: 2 x 9 2 x 3 x 3, so the two prime numbers that give you 18 are 2 and 3.