The square root of a number is simply the inverse operation of squaring that number. In other words, the square of a number is that number times itself.
since 2^2 =4, the square root of 4 is therefore 2; (`sqrt(4)` =2)
since 3^2=9, the square root of 9 is therefore 3;
since 4^2=16, the square root of 16 is therefore 4;
Basic on what we have discussed, it's not difficult to conclude that the square root of the square of the number is just the same number. For example: