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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

31

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

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.

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

51 is composite.

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

51 = 3 x 17

31 is a prime 51 = 3 x 17

30 = 21 x 31 x 51

No, 51 is not a prime number. A prime number is a number that has only itself and 1 as a factor. 51's factors are 1,3,17, and 51.

Dissolving into prime divisors we get 16 = 24 14 = 21 * 71 12 = 22 * 31 10 = 21 * 51 8 = 23 6 = 21 * 31 Taking the greatest exponents for each prime, we get lcm(16,14,12,10,8,6) = 24 * 31 * 51 * 71 = 1680

the next prime number after 51 is 60 :)

47, yes. 51, no.

51 is a composite number but 61 is a prime number

It is: 51 because it has more than two factors and so therefore it is a composite number

It is: 21*32*51 = 90

51 is composite. 51 = 3 x 17. The other three numbers are prime numbers.

51 is not a prime number. It is divisible by 3.

51 is composite.