The square root of 39 is 6.24. The square root of any number can be determined by plugging it into the equation x times x equals y. When solving this formula to find the square root of 39, the formula is 6.24 times 6.24 equals 39.
In some cases, the square root can be simplified by factoring out the square root of a whole number. However, 39 does not contain any of the lower square roots of 4, 9, 16, 25 or 36. The simplest way to determine the square root of a number that cannot be simplified is to use the square root function on a graphing calculator.