13 is prime.
13
3 x 5 = 15, so 15 is not a prime number.
13 has no factors other than itself and unity.
13
A prime number can only be divided by itself and 1. 4 can be divided by 2 26 can be divided by 2 15 can be divided by 3
3 and 5 are prime numbers but if you mean 13 14 15 18 then it is 13
13
3 x 5 = 15, so 15 is not a prime number.
1 13 is a prime number.
13 has no factors other than itself and unity.
2,3,5,7,9,11,and 13
13
A prime number can only be divided by itself and 1. 4 can be divided by 2 26 can be divided by 2 15 can be divided by 3
No, 13 is a prime number and 15 is a composite number. A composite number is a positive integer that has more than two positive divisors.
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.
13, it's the only prime. All the other ones can be divided by something other than 1.
13 is prime 14=2x7, 2 factors 15=3x5, 2 factors 16=24, 4 factors 17 is prime 18=2x32, 3 factors 19 is prime So the answer is 3 (14, 15 and 16)