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Is 21 prime or not prime?

Updated: 10/24/2023
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Wiki User

14y ago

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21 is not a Prime number. It is divisible by 3 and 7, in addition to 1 and itself.

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4mo ago
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14y ago

21 = 3x7, and so is not prime, as it can be expressed as the product of multiple prime numbers

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Q: Is 21 prime or not prime?
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Related questions

What is the prime numbers of 21?

Do you mean, "What is the prime factorization of 21?"


What is the prime factorizatiion of 21?

The prime factorization for 21 is 3x7.


Is 21 and 89 a pair of prime numbers?

21 is not prime.


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It can be. 21 is relatively prime with 32.


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number 21 is prime


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3 * 7 = 21 21 is not prime


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The prime factorization for 21 is: 3x73 x 7 = 21


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11 is a prime number but 21 is not a prime number as it is divisible by 3.


Is the prime number 21 is a prime number?

21 is a composite number, not a prime, having prime factors 3x7.


How do you do prime factorization with the number 21?

3 x 7 = 21, since both factors are prime, that is the prime factorization of 21.


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21 has two prime factors.


Are 17 and 21 prime numbers?

17 is a prime number, but 21 is not (21 = 3 * 7).