Question

What is the square root of -1?

Answer 1

What is an imaginary number?
Imaginary number squared is equal to -1.
But as you know, no number in the universe squared is ever equal to -1.
Even -2 x -2! negative negative = positive 

This imaginary number is imaginary because it is defined as non-existent yet, in my words (when I learned it), I took it as half existing number and half non-existent number.

And what do you get when you take the square root of i$^{2}$?

i = $\sqrt{-1}$.

Hope this helps!