Which numbers are square numbers?

Answer 1

Any numbers that can be written as the product of some number with itself e.g.:

1 = 1*1

4 = 2*2

9 = 3*3

16 = 4*4

100 = 10 * 10

There are an infinite number of square numbers so you can't expect a comprehensive list.

Answer 2

Square numbers are numbers that can be obtained by multiplying an integer by itself. For example, 4 (2x2), 9 (3x3), 16 (4x4), and 25 (5x5) are square numbers.