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 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)
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
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.
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.
13, it's the only prime. All the other ones can be divided by something other than 1.