It is composite because it has more than 2 factors
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The greatest composite number under 100 is 99. The greatest composite factor of 100 is 100.
100 is composite.
Question is meaningless.
The factors of 100 are 1, 2, 4, 5, 10, 20, 25, 50, 100 2 and 5 are prime. 1 is neither. The rest are composite.
Out of those 100 numbers, 21 of them are prime numbers, so the remaining (100 - 21) = 79 are composite.