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A Prime number is a number that only has two factors. That is, it can only divide evenly (without leaving a remainder) by 1 and itself. 21 can divide by 3 to give 7. Therefore it has more factors than just 1 and itself. Thus twenty-one is not a member of the prime number set.

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Q: Is twenty-one a member of the prime number set?
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Related questions

Is seventeen a member of the prime number set?

A prime number is a number that only has two factors. That is, it can only divide evenly by 1 and itself. 17 cannot divide by any number in between 1 and itself. Thus it has only two factors. Therefore 17 is a member of the prime number set.


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No, a prime factor is a single factor that is a prime number. A proper factor is a member of the set of factors that doesn't include one and the number itself.


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2 is the only member of both the set of all prime numbers and the set of all even numbers.


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A number is relatively prime to another number or set of numbers when their GCF is 1.


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All numbers have factors. Some factors are prime numbers. These are known as prime factors. The set of prime factors is a subset of the set of factors for any given number.


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The 20th prime is 71.


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The LCM of a set of prime numbers is their product.


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No it is not. By definition, a prime number must be a natural number. Negative numbers are not in the set of natural numbers.


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