Because it can be divided by more than two factors.
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15 is composite.
Composite.
15 is a composite number - it is the product of 3 and 5. (3*5=15)
2 is a prime number and 15 is a composite number.
No, 13 is a prime number and 15 is a composite number. A composite number is a positive integer that has more than two positive divisors.