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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, & 21
No. 21=3*7
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Is 21 a prime number of composite?
21 is a composite number
Which of these numbers is not a prime number A 21 B 31 C 41?
21 is not a prime.
Which is prime 21 33 47 78?
47 is a prime number.
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
Which is the prime number 21 22 23 24 25 26?
21 22 23 24 which is the prime number
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.
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 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 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 prime composite or neither?
3 * 7 = 21 21 is not prime
Is 21 a prime number of composite?
21 is a composite number
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!
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.
