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Q: Why 57 51 are not prime numbers?

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No because they are both composite numbers

51, 53, 57, 59.

No. Neither one are. 51 = 17 x 3 57 = 19 x 3

because it has two or more factors

(51+57)/2 = 54

57 is divisible by the prime numbers of 3 and 19

No, neither 27 nor 57 are prime numbers.

Yes; they are 51, 53, 57, 59.

No, and 57 is not a prime number.

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

57=3x19

There are ten prime numbers between 51-100.

The prime numbers between 51 and 60 are 53 and 59.

57=3x19

No two prime numbers satisfy that request.

110

The prime numbers in the range 51 - 70 are 53, 59, 61 and 67.

61 is the prime number.

The prime factors of 51 are 3 and 17.

There are three prime numbers between 57 and 69. They are 59, 61, and 67.

53

53

3 x 17 = 51

Neither 50 nor 51 are prime numbers.

No.