whats the square root of1

I'd like to point out that if the square root is writen into the question then only the positive answer counts.

But if you put it there as a part of your  solution it can be pos or neg

for example 

$$\sqrt4=2$$

but if

$$x^2=4\quad then\\\\
x=\pm \sqrt4\\\\
x=\pm2$$

√1 = 1

 

1*1 = 1, so this works!

 

The number one is interesting in this way because if you keep multiplying or dividing one by one, you will keep getting one.

This means something like

⁹⁹⁹√1 = 1