28, like all even numbers greater than 2, is a composite number.
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A composite and a square.
composite and 2*2*7 = 28
28 is composite.
Composite. Its prime factors are 2×2×7.
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. 36 is square and composite.