In mathematics, a square of a number means the result of multiplying the number by itself. For example, the square of 6 is 6×6 = 36.
Squaring a number can also be written as 62 = 36.
Many of the units of area are squares. For example, a square meter means the area equal to the area of a rectangle which is one meter tall and one meter wide.
Square (algebra) Facts for Kids. Kiddle Encyclopedia.