Question

Is the integer below prime or composite?

39

A. prime
B. composite

Answer 1

What do you think?

Answer 2

Prime numbers are only divisible by 1 and itself.
Composite numbers can be divisible by numbers other than 1 and itself.

Can you think of any numbers that can go into 39 that aren't 1 or 39?

Answer 3

Try putting them in your calculator.

39 / 2
39 / 3
39 / 4
etc.

If you get a whole number for any of these, then it's a composite number.

Answer 4

This number has only 2 factors,1 and 39 itself...no other number...therefore it is prime.
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