Both are composite.
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Yes. A composite number is a number that is not prime. In the case of 225, it can be broken down to 5 * 5 * 3 * 3, and is thus composite.
105, 210, 315, 420, 525
The GCF is 15.
900 is not prime. 900 = 2 * 2 * 3 * 3 * 5 * 5
4, composite. 67, prime.