Finding the probability of a single die roll requires little effort.
First, remember that by definition, a prime is an integer with precisely two factors: 1 and the number itself (which is why 1 does not qualify: it has only one factor). The numbers from 6 on down that fit the bill are 2,3,5. Since there are six sides, your answer is:
Yes, but the answer I think the question is asking for is 5/4, not 1 1/4 since a fraction greater than one is usually that the numerator is greater than the denominator or known as a improper fraction. I'm not sure if my answer is correct but I think it is.