The square root of 4 is 2

 The square root of 4 is 2.

A square root of a number is a value that, when multiplied by itself, gives the original number. So in this case, the square root of 4 is 2 because 2 x 2 = 4.

It can be also represented in the imaginary number as 0+2i

Additionally, it's worth noting that there are always two square roots for any number (one positive and one negative), but only the positive square root is used in mathematics.

Also there is a concept called principal square root which always refers to the non-negative value when you calculate square root.