Square numbers are whole integers that can be made my multiplying an integer by itself. This is, in effect, literally _squaring_ the number line. Fun facts: - any number can be expressed as the sum of no more than 4 square numbers - square numbers follow the sum of odd numbers (1, 1+3, 1+3+5). - This is true because it takes the next bigger odd number to create a new layer around a literal square **** # More ## Source - self ## Related