what is the square of a natural number?
If N is a natural number, n^2 is its square. For example, 1^2 = 1, 2^2 = 4, 3^2 = 9, 4^2 = 16, 5^2 = 25, 6^2 = 36, 7^2 = 49, 8^2 = 64, 9^2 = 81, and {10}^2 = 100 are the squares of the first ten natural numbers.