87 is the only 2-digit number that is 6 greater and 13 less than a square, but it is not prime.
something I don't know
The number must be 42.
The square of any number greater than 10 (or less than -10) will be greater than 100.
The number is 57.
Yes, if the number is less than '1'.Just the opposite, if the number is greater than '1'.
9 is an odd square number less than 10 and 92 = 81 which is greater than 50
when the number is greater than 1
Work it out with a few clues. Only a 3 can be the last digit of number whose square has a 9 at the end. There are 4 digits in the square, so the root is greater than 31, and less than 100. The square of 5 = 25, so the square of 50 = 2500