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Q: What number is a prime number 91 51 31 21?

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31 is a prime number.

31

31

31

51 is not a prime number: 3x17=51

51 is composite number

21 is divisible by 3 and 7, so it is composite. 91 is divisible by 7 and 13, so it is composite. 51 is divisible by 3 and 17. 31 is divisible by only 1 and itself, so it is the prime number.

91 = 13*751 = 17*321 = 3*731 is prime. â–

51 is composite.

31 is prime, but 51 is not as 51=3*17.

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What number is a prime number 91 51 31 21?

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