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Q: Is 21 and 31 a prime number?

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31 is a prime number.

31

31

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

It is: B 31 is a prime number because it has only two factors which are itself and one

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31 is a prime number.

31

31

31

21 is not a prime.

31 is the only one that has only two factors: 1 and itself. It is the prime number.

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

21 = 3 * 7 31 = 31 (it is prime) 100 = 2 * 2 * 5 * 5

31 and 61 are prime, the rest composite.

It is: B 31 is a prime number because it has only two factors which are itself and one

31 is a prime number

21.

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