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The greatest composite number under 100 is 99. The greatest composite factor of 100 is 100.
100 is composite.
It is composite because it has more than 2 factors
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.