16 is a composite number because it has at least one positive factor other than one or itself.
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A not a prime number is a number that is divisible only by 1 and itself; it has no other factors. A composite number is a number that is divisible by more than 2 numbers. The factors of 32 are 1, 2, 4, 8, 16, and 32. Therefore, 32 is a composite number.
13 is prime 75 = 3 x 25 and so on 16 = 2 x 8 and so on
It is prime
86 is not a prime number, so is a composite.
No 168 is not a prime number it is a composite number