The square root of 156 is 12.4899959968. When a person multiplies the number 12.4899959968 by itself, the answer results in 156.
Perfect squares occur when a positive number is multiplied by itself. When deriving a square root from a perfect square, it results in the original number; for example, 3 x 3 = 9. The square root of 9 is 3, therefore, it is a perfect square. Square roots that have fraction or decimal points are not perfect squares and they are harder to obtain. Square roots are derived from handwritten methods, but most calculators have a square root function.