3 digit number 1 digit is prime and 1 digit is square. the other is neither prime or square. what is the greatest value

Question

 the number cannot be divisible by 3

Answer 1

Thee 1-digit primes are:   2, 3, 5, 7     The largest is 7.

 

The 1-digit perfect squares are:   1, 4, 9    The largest is 9.

 

The other digits are:   6, 8         The largest is 8.

 

The largest number with all three has (the largest of all) then (the largest of the other two groups) then (the largest of the remaining group).   The largest such number is:

        987, but it is divisible by 3    (3*329)

    So, 985.

Answer 2

The 1 digit primes are 2, 3, 5,7

 

The 1 digit perfect squares are 1, 4, 9

 

985 is the number