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97 is the largest 2-digit prime number.
11 is the smallest 2-digit prime number and 97 is the greatest 2 digit prime number, so their difference is 86
73 7-3 = 4 73 is prime and 37 is prime.
There is only one even prime number (2). There are no 8-digit even primes.
For the tens digit to be a prime number then it must equal 2, 3, 5 or 7. There are four 3-digit prime numbers that fit the above condition and also have the tens and units digits forming a 2-digit prime number. 131, 137, 173, 179. The person supplying the question may like to sum the various combinations.