In mathematics, the square root of a number is a factor of that number that, when multiplied by itself, gives the original number. The symbol for square root is √ . For example, the square root of 9 is 3 because 3 multiplied by itself equals 9. Finding the square root of a number is the opposite of squaring a number. In other words, if x is the square root of y, then x multiplied by itself equals y. The square root function is defined as a one-to-one function that takes a positive number as an input and returns the square root of the given input number. The square root symbol is usually denoted as ‘√’ and the number under the radical symbol is called the radicand.