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Who says it is? 21 is a composite number!

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โˆ™ 2012-02-17 01:47:03
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Q: Why is 21 a prime number?
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Related questions

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.


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 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 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 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 441 a prime number?

no, 21*21=441


Is 21 a prime number of composite?

21 is a composite 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 the number 21 a prime?

No.


Is the number 21 prime?

No.


Is 21 x 2 a prime factorization of 42?

No, 21 is not a prime number.


What prime number have 21?

21 has two prime factors, 3 and 7.


What is a prime number for 12 and 21?

3 is a prime factor of 12 and of 21.


Are 17 and 21 prime numbers?

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


Which of these numbers is not a prime number A 21 B 31 C 41?

21 is not a prime.


Is the number 21 prime number?

no. 7 x 3 = 21


21 a prime or a compostie?

21 is a composite number.


Is 21 prime or compostie?

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.


What is the prime factorization of number 21?

The prime factorization of 21 is 3 x 7.


Which of 21 31 51 and 91 is a prime number?

31 is a prime number.