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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
What is the prime number out of 21 23 and 25?
21 = 3 x 7, so it is not a prime number. 23 = 1 x 23, it does not have any other factors, so it is a prime number. 25 = 5 x 5, so it is not a 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.
