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Q: What is a prime number for 12 and 21?

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number 21 is prime

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

12 (2x2x3)

10 and 21

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

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

There is no such prime number. If it can be divided by 12 then it is not prime.

13 is the prime number after 12.

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.

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

12 is a composite number that is a multiple of 2. 12 is not a prime 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.

3 * 7 = 21 21 is not prime

no, 21*21=441

Who says it is? 21 is a composite number!

21 is a composite 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.

No.

No.

No, 21 is not a prime number.

21 has two prime factors, 3 and 7.

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