Neither. Prime number or composite numbers should be whole numbers, not fractions.
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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.
Both are composite.
Prime factors of 225=3x3x5x5.
The number is not COMPOSITE. Instead, it is a prime number.
Composite (the only even number that is prime is2).