The factors of 99 are 1, 3, 9, 11, 33, and 99.
Since 99 has more factors in addition to '1' and itself, it's a composite number.
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99 is a composite 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.
Composite 3*3*11= 99
99 is a composite number because it has more than two factors
495/5 = 99 99/33=3 its composite
12, 49, and 99 are composite, the rest are prime.
Look up a list of prime numbers (a Google search for "prime numbers" or "list of prime numbers" should do); every number (greater than 1) that is NOT a prime number is composite.