A Prime number can only be divided by itself and 1.
4 can be divided by 2
26 can be divided by 2
15 can be divided by 3
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13 is prime.
3 x 5 = 15, so 15 is not a prime number.
13
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.
7 or 13