So, the prime factors of 21 are 3 and 7, where 2 and 7 are the prime numbers. Prime factorisation of 21 is 3 × 7.11-Sept-2020,

## Is the number 21 prime or composite?

The first 10 multiples of 21 are 21, 42, 63, 84, 105, 126, 147, 168, 189, and 210.10-Feb-2022

## How do you make 21?

No, 21 is not a prime number. The number 21 is divisible by 1, 3, 7, 21. For a number to be classified as a prime number, it should have exactly two factors. Since 21 has more than two factors, i.e. 1, 3, 7, 21, it is not a prime number.

## What are the factors of 21?

1 x 21 = 21. 3 x 7 = 21.

## What is the prime numbers of 21?

So, the prime factors of 21 are 3 and 7, where 2 and 7 are the prime numbers. Prime factorisation of 21 is 3 × 7.11-Sept-2020