No. 15 is not a Prime number because it has one or more divisors. Example 15/3=5 15/5=3
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5 is but 15 is not a prime number
The prime factors of 15 are: 3, 5
15 is a factor of 45, but it is not a prime number.
The prime factors of 15 are 3 and 5.
3 and 5 are Prime Factors of 15 (3x5=15).