Q: Which one of these numbers are prime 11 15 21 27 56?

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11 and 13 are prime numbers but 15 is a composite number because it has more than two factors

All except 15

They are: 5 7 11 and 13

No, they are composite numbers. The factors of 15 are 1, 3, 5, and 15. The factors of 33 are 1, 3, 11, and 33. Prime numbers have two factors: 1 and the number itself, so 15 and 33 cannot be prime.

The first four prime numbers greater than 10 are , 11, 13,17,19 Their mean is (11 + 13 + 17 + 19) / 4 = 15 NB '15' is NOT a prime number.

Related questions

The prime numbers between 6 and 15 are: 7, 11, 13

11 and 13 are prime numbers but 15 is a composite number because it has more than two factors

All except 15

The prime numbers between 10 and 15 are 11 and 13.

The numbers 5, 7, 11 and 13 are prime.

Prime numbers from 1 to 15 are 2, 3, 5, 7, 11 and 13.

15 is composite number

No because 11 is a prime number but the rest of them are composite numbers.

The prime numbers are: 2 3 5 7 11 and 13 so therefore as a fraction of 15 it is 6/15 or 2/5 simplified

There are six prime numbers that are less than 15: 2 3 5 7 11 and 136 of them.

They are: 5 7 11 and 13

11+3+1=15 but 1 is not a prime number. 3 + 5 + 7 = 15