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

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โˆ™ 2012-03-29 09:54:11
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Q: Is the prime number 21 is a prime number?
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Related questions

Is number 21 prime or composite?

number 21 is prime


What are prime number greater than 21?

There is an infinite number of prime numbers that are greater than 21. The next prime number after 21 is 23.


Are 11 and 21 prime numbers?

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


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 21 and 31 a prime number?

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


Which is the prime number 21 22 23 24 25 26?

21 22 23 24 which is the prime number


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 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


Are 17 and 21 prime numbers?

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


Is the number 441 a prime number?

no, 21*21=441


Why is 21 a prime number?

Who says it is? 21 is a composite number!


Is 21 a prime number of composite?

21 is a composite number


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.


Is 21 x 2 a prime factorization of 42?

No, 21 is not a prime number.


What is a prime number for 12 and 21?

3 is a prime factor of 12 and of 21.


What prime number have 21?

21 has two prime factors, 3 and 7.


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.


Is the number 21 prime composite or neither?

3 * 7 = 21 21 is not prime


Is the number 21 prime number?

no. 7 x 3 = 21


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


Are 11 and 21 prime?

11 is prime; 21 is not. To see whenever a number is prime or not, think if a number can be multiplied by another number to get that number. Or just look at a Sieve of Eratosthenes, if you're not a "thinky" person. :)


Why is 21 not a prime number?

21 isn't a prime number because it has more factors than just itself and 1 3x7=21 21x1=21


What is the prime factorization of number 21?

The prime factorization of 21 is 3 x 7.


What are the prime factors of 21?

prime factor = prime number which can be divided into the given number with no remainder The prime factors of 21 are 3 and 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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