31, 53, 97
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nine is not a prime number
The possibilities for a digit in the ones place of a prime number greater than 5 are 1, 3, 7, and 9. If a 0, 2, 4, 6, or 8 is in the ones place, the number is divisible by 2, so it would not be prime. If a 5 is in the ones place, the number is divisible by 5, so it would not be prime.
All but the number five are multiples of 5.
97
Given the information in the question, the number is indeterminate.