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# Is 21 prime or not prime?

Updated: 10/24/2023

Wiki User

14y ago

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

4mo ago

Wiki User

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.

21 is not prime.

### Is 21 relatively prime?

It can be. 21 is relatively prime with 32.

### Is number 21 prime or composite?

number 21 is prime

### Is the number 21 prime composite or neither?

3 * 7 = 21 21 is not prime

### What is the prime factorization for 21?

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

### 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 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.

### How many prime numbers are there in 21?

21 has two prime factors.

### Are 17 and 21 prime numbers?

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