square number

This is the result of multiplying a number by itself.

For example, the square of the number 6 is 36, namely 6 × 6.

Therefore, 36 is a square number.

Here are the first five square numbers:

1 (= 1 × 1)

4 (= 2 × 2)

9 (= 3 × 3)

16 (= 4 × 4)

25 (= 5 × 5)