Perfect Square

Perfect square is a result of multiplying whole number by itself.

Whole number 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Perfect square (square of a whole number) 0 1 4 9 16 25 36 49 64 81 100 121 144 169 196 225

Perfect numbers are written on the main diagonal of the multiplication table.

For more information, see squares and square numbers.