The square root of a number is a value that, when multiplied by itself, gives the original number.

For example, the square root of 25 is 5 because 5 × 5 = 25.

Key points:

• Square roots of negative numbers are not real numbers

• The square root of 0 is 0

• For most numbers, square roots are irrational numbers with infinite decimal places

• This calculator provides results to 8 decimal places for precision