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99 = 3 x 3 x 11. For any number up to 100, you can quickly determine whether it is composite by trying to divide by 2, 3, 5, and 7. For larger numbers, you may need to test more factors, up to the square root of the number.

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Q: Is ninety nine a composite or prime?
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Related questions

Is 99 a prime number or a composite?

99 (Ninety nine) is composite, because it can be multiplied by 11, and 1.

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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. 98 is composite.