79 is a Prime number. A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite.
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It is a prime.
It is a prime.
It is a prime.
If you want both then it is every number, all numbers are eather prime or composite.
Out of those 100 numbers, 21 of them are prime numbers, so the remaining (100 - 21) = 79 are composite.