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Subjects>Math>Math & Arithmetic

Is 21 a prime or composite number?

Updated: 10/18/2022

Wiki User

∙ 11y ago

Best Answer

21 is a Composite Number.

A Prime number is a whole number that only has two factors which are itself and one. A composite number has factors in addition to one and itself.

21 is divisible by 3 and 7.

Wiki User

∙ 10y ago

This answer is:

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Wiki User

∙ 12y ago

Factors of 21 are 1, 3, 7, and 21. 21 is a compositenumber because it has more factors than just 1 and itself.

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Wiki User

∙ 11y ago

It is composite because it has more than two factors

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Wiki User

∙ 11y ago

It is composite because it has more than 2 factors

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Wiki User

∙ 11y ago

Composite, 21=3*7

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Wiki User

∙ 12y ago

Composite

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Wiki User

∙ 7y ago

Composite.

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Anonymous ∙

Lvl 1

∙ 3y ago

Prime

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Anonymous ∙

Lvl 1

∙ 3y ago

prime

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Anonymous ∙

Lvl 1

∙ 3y ago

No

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Q: Is 21 a prime or composite number?

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Continue Learning about Math & Arithmetic

Is number 21 prime or composite?

number 21 is prime

Is the prime number 21 is a prime number?

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

Why is 21 a prime number?

Who says it is? 21 is a composite number!

Is 21 and 31 a prime number?

21 is composite number that is a multiple of 3. 31 is a prime number.

Is 23 21 19 prime or composite?

19 is a prime number. Its only factors are 1 and 19. 21 is a composite number. Its factors are 1, 3, 7, and 21. 23 is a prime number. Its only factors are 1 and 23.

Related questions

Is 21 a prime number of composite?

21 is a composite number

Is number 21 prime or composite?

number 21 is prime

Is the prime number 21 is a prime number?

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

Why is 21 a prime number?

Who says it is? 21 is a composite number!

21 a prime or a compostie?

21 is a composite number.

Is 21 prime or compostie?

21 is a composite number.

Is the number 21 prime composite or neither?

3 * 7 = 21 21 is not prime

Is 21 and 31 a prime number?

21 is composite number that is a multiple of 3. 31 is a prime number.

Is this number prime or composite 21?

A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite. 21 is composite.

Is 23 21 19 prime or composite?

19 is a prime number. Its only factors are 1 and 19. 21 is a composite number. Its factors are 1, 3, 7, and 21. 23 is a prime number. Its only factors are 1 and 23.

Is 21 a prime number?

A prime number is any integer evenly divisible by only itself, and the number 1. Since 21 is divisible by 3 and 7, it is a composite number, not a prime number.No, 21 is not a prime number.21 is divisible by 1, 3, 7, & 21No. 21=3*7

Which number is not a prime or a composite number 21 15 8 and 1?

1 is not composite or prime.

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