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Q: Which of these is a prime number 16 17 18 15?

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The next prime number after the composite number of 16 is 17

3 x 5 = 15, so 15 is not a prime number.

It is 17.

The prime numbers between 15 and 30 are: 17, 19, 23 and 29

17

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Number 17 is but 15 isn't as 5x3 isn't a prime number

The next prime number after the composite number of 16 is 17

17

3 x 5 = 15, so 15 is not a prime number.

It is 17.

It is 17 since 14, 15, and 16 are not prime. It is easy to see right away that 14 is not prime because 2 is the only even prime. Of course, 15 has factors of 3 and 5 so it is not easy. 16 is also even. 17 is prime since its only factors are 1 and itself.

The prime numbers between 15 and 30 are: 17, 19, 23 and 29

17

Even number bigger than two are never prime so cross them out, leaving11,13,15,17,19Any number ending in 5 is divisible by 5 and so can not be prime,This leaves 11,13,17,19 which all could be prime and actually are.

15 is composite number 17, 19 and 23 are prime numbers.

The answer is 15.75

17