Prime or composite?
Help
Is 15 a prime? Why?
No, 15 is a composite number since besides 1 and itself, 3 is also one of its factors.
Is 13 a prime? Why?
Yes, 13 is a prime since it only has two factors: 1 and itself.
Is 17 a prime? Why?
Yes, 17 is a prime since it only has two factors: 1 and itself.
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