3 and 5
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Prime factors of 18 are 2 and 3 Prime factors of 15 are 3 and 5
Two prime factors.
The prime factors of 15 are: 3, 5
A number is prime if it has only 1 and itself as factors. For example, 7 is a prime number because it has only 1 and 7 as factors. 15 isn't a prime number because it has 1, 3, 5, and 15 as factors.
The prime factors of 15 are 3 and 5.