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No, 21 is not a Prime number. It can be divided evenly by numbers other than 1 and itself, such as 3 and 7.

Q: Is 21a 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.