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Subjects>Math>Math & Arithmetic

Why is 21 a prime number?

Updated: 11/3/2022

Wiki User

∙ 13y ago

Best Answer

Who says it is? 21 is a composite number!

Wiki User

∙ 13y ago

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Q: Why is 21 a prime number?

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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.

Is 21 seven a prime number?

21 is the product of two prime numbers, three and seven. A prime number is defined as a number divisible only by one or itself. So ... NO ... 21 is not a prime number.

Is 21 and 31 a prime number?

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

Is 21 a factor of a prime number?

No. The only factors of a prime number are 1 and itself. The only way that 21 could be a factor of a prime number is if it were a prime number, but it is not because 21 is also divisible by 3 and 7.

Related questions

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.

Are 21 and 11 prime numbers?

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

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

Is 21 seven a prime number?

21 is the product of two prime numbers, three and seven. A prime number is defined as a number divisible only by one or itself. So ... NO ... 21 is not a prime number.

Is 21 and 31 a prime number?

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

Is 21 a factor of a prime number?

No. The only factors of a prime number are 1 and itself. The only way that 21 could be a factor of a prime number is if it were a prime number, but it is not because 21 is also divisible by 3 and 7.

Is the number 21 prime composite or neither?

3 * 7 = 21 21 is not prime

Is 21 a prime number of composite?

21 is a composite number

Is the number 441 a prime number?

no, 21*21=441

Are 17 and 21 prime numbers?

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

Which of these numbers is not a prime number A 21 B 31 C 41?

21 is not a prime.

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