52 is a composite number because it has factors in addition to (52 & 1). If a number has only the two factors (itself and 1) then it is prime. Every whole number greater than 1 will have at least those two factors. The number 1 has only one factor (1). Numbers that have more than two factors are called composite numbers.
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42 and 52 are composite.
It's even. It must be composite.
52
52 is composite. 2 x 2 x 13 = 52
100 is composite. 100 = 2 * 2 * 5 * 5 = 22 * 52