What is the square root of 441?

The square root of a number is a number (Integer) whose product by itself results in the initial number.

441 = a × a = 21 × 21

Then a = √441 = √(21 × 21)

21 × 21 = 441 or -21 × -21 = 441

The square root of 441 is +21 or -21.