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100 is composite. 100 = 2 * 2 * 5 * 5 = 22 * 52
100 is composite, because it has more than 2 factors.
The two-digit factors of 100 and 1000 are all composite.
100 is a Composite number. A number that has positive divisor other then number 1 and the number itself is called a Composite number. For example, 100 has divisors, which are 2,4,5,10 and so on. So it clearly defines itself as a Composite Number.
99 is the largest composite number before 100.