Is 15 prime or composite?

Mathematics
Tutor: None Selected Time limit: 1 Day

On my homework paper it says is 15 a prime number or a composite number so which one is it?

May 11th, 2015

15 is a composite number.

A prime number is a number which is only divisible by 1 and itself. 

15 is divisible by 1, 3, 5 and 15. therefore it is composite number.

May 11th, 2015

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May 11th, 2015
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