What is square root-?

Answer 1

I think you mean square root. The square root of a number is that number when multiplied by itself will give the original number. For example the original number is 4, then we know that 2 x 2 is 4, hence 2 is the square root of 4. We also know that -2 x -2 is also 4, hence 4 has two square roots, +2 and -2

Similarly 9 has two square roots, +3, and -3

Similarly 16 has two square roots, +4, and -4

Not all numbers have such whole numbers for their square roots. For example the square roots of 2 are nearly equal to +1.4142 and -1.4142. Similarly the square roots of 3 are nearly equal to +1.73205 and -1.73205

Answer 2

A number that when multiplied by itself equals a given number

Answer 3

Square root is the result you get when you multiply a number by itself.