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Why isn't 21 a prime number?

Anonymous

∙ 9y ago

Updated: 9/23/2022

It has more than two factors.

Wiki User

∙ 9y ago

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What is a number called when it isnt a prime number?

Composite

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.

Related Questions

A number that isnt a prime number?

Composite

What is a number called when it isnt a prime number?

Composite

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 isnt 39 a prime number?

39 is not a prime number because it has four factors: 1,3,13,39 and because prime number are numbers who has 2 factors.

Are 21 and 11 prime numbers?

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

Can five over nineteen be reduced?

no, 5 isnt divisable by 19. 19 is a prime number and isnt divisable by anything.

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 there an equation to find prime numbers?

a prime number is a number that can only be divided by 1and its self... 1 isnt a prime number but 2, 3, 5, 7, 9, 11 etc... are prime numbers.

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