The square root of a number is the number that when multiplied by itself, creates the original number. For example, the square root of 16 is 4 because 4 x 4 = 16. To find the square root of a whole number it is best to use a calculator or a math table.
For example, if you want to find the square root of 100, you would type 100 into the calculator and press the square root button. The calculator would output the answer as 10.