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With a standard 6-sided die, the probability of rolling a prime number is 1/2
1 out of 2
The probability of rolling a prime number on a standard 6-sided die is 3 in 6, or 0.5.The sample space is [1 2 3 4 5 6] and the result space is [2 3 5]. 3 divided by 6 is 0.5.
Since there are 3 prime numbers, 13, 17, and 19, in the range 12 to 19, the probability of throwing a prime number on a fair eight sided die numbered 12 to 19 is 3 in 8.
If you mean a regular six-sided die, there are 3: 2,3 and 5. Some people would argue that 1 is a prime number, but in fact 1 is not, as it only has one natural number divisor, while prime numbers have exactly two distinct natural number divisors.