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A Prime number is any number that only has one and itself as factors. Threfore, any number taht has more than two factors is not prime. Check the the factors of a number to tell if it is prime or not.

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Q: Which number is not a prime number?

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A prime number times a prime number is a composite number. Since prime numbers, except for 2, are odd numbers, a prime number times a prime number is usually an odd number. It will only be an even number if one of the prime numbers is 2. A prime number times a prime number will be a number with four factors unless both prime numbers are the same, in which case it will be a square number with only three factors.

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