Answer :
93 is not a multiple of 9. Multiple of 9 would be 90 or 99. These are multiples of 9 in a range from 0 up to 100:
9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99
9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99