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21 is a composite number. 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.

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โˆ™ 2012-02-26 17:07:15
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โˆ™ 2017-02-15 21:59:16

1, 3, 7 and 21 which makes it composite.

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Q: What are the factors of 21 is it composite or prime?
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Is 21 a prime number or a composite number?

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.


List all the factors of 21 is the number 21 prime or composite?

The factors of 21 are 1, 3, 7, and 21 which means that 21 is composite.


Is the prime number 21 is a prime number?

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


Is 19 21 or 23 composite or prime?

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 composite number or prime?

It is composite because it has more than 2 factors


Is 21 a prime composite or neither number?

21 is a composite number because it has more than two factors


Why is 21 composite and not prime?

21 has the factors 21,1,7,3. 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.


Is 21 a prime or composite number why?

composite because it has more than two factors.


Is 21 composite or prime?

21 is composite, because 21 has more than 2 factors (1,3, and 7)


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 21 an prime or composite number?

It is a composite number because it has more than two factors


Are these numbers prime or composite 21?

21 is a composite number. 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.


Is there a prime number that is a multiple of 21?

No, it is not possible. Every multiple of 21 is a composite number. 21 is a composite number and its factors are 1, 3, 7 and 21(4 factors). Any multiple of 21 must have all the factors of 21. So, every multiple of 21 has at least 4 factors. And a prime number has only two factors so, any multiple of 21 can't be prime.


What is 21 a prime or composite?

21 is composite


Is 21 a prime or a composite?

21 is composite.


What is the prime or composite of 21?

21 is composite.


Is 21 one a prime?

No 21 is not a prime number because it has more than two factors therefore it is a composite number


Is 63 composite are prime?

63 is composite: its factors are 1, 3, 7, 9, 21 and 63.


Is number 21 a prime number or a composite number?

It is composite because it has more than two factors


Is 21a prime number or a composite?

21 is a composite number because it has more than two factors


What prime numbers 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 21 and 27 prime and composite numbers?

A prime number has exactly two factors, 1 and the number itself. The factors of 21 are 1, 3, 7, and 21, and the factors of 27 are 1, 3, 9, and 27. Since 21 and 27 have more than 2 factors, they are composite numbers.


Is 21 prime or composite?

composite- 7x3=21


Is 21 a prime or composite?

Composite


What are the prime factors of a composite prime number?

There is not such a thing as a composite prime number. A prime number has exactly two factors. A composite number has more than two factors.