Digit Sums of Perfect Squares

žAll Perfect Squares

  end in 1, 4, 5, 6, 9 or 0

                            and

  digit sums are 1, 4, 7 or 9

Example :4539

  ends in 9

  digit sum is 3

  Therefore, 4539 is not a perfect square

Example 5776

         ends in 6

  digit sum is 7

  Therefore, 5776 may be a perfect square  

9 Point Circle & Digital Sum