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

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31 and 41 are prime numbers because they have only two factors

21

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

31 is a prime number.

31 is prime.

The prime numbers from 21 to 40 are 23, 29, 31, and 37.

there are 3 prime numbers in between 21 and 33... they are 23,29, 31.

31 is a prime number. Its only prime factor is 31.

There are 3 prime numbers from 21 to 35:23, 29 and 31

Yes, 31 is a prime number. If you Google "Prime Numbers", you can see a chart of all the prime numbers.

21 is composite as 3 times 7 is 21 31 is prime

31

The prime numbers between 21 and 40 are: 23 29 31 37.

The numbers 23, 29, 31 and 37 are prime.

31

31

31

They are: 23, 29 and 31

1 and 31 (31 is a prime number).

It is 31 because it has only two factors which are itself and one

Not necessarily. For example 15 and 16 are composite numbers. They add to 31, which is a prime number. Similarly, the composite numbers 20 and 21 add up to 41, which is a prime number.

23, 29 and 31

23 29 31 37.

23 29 31.

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