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21 is not a Prime number. It is divisible by 3 and 7, in addition to 1 and itself.
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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.
How many prime numbers are there in 21?
21 has two prime factors.
What are prime numbers of 21?
factors of 21: 3, 7 prime factors of 21: 3, 7
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.
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