what is the square root of 128745

The square root of 128745 is 358.810535

I'll take your word for it Foxtears but you should point out that it is an approximation.

If you use the Math(Input=Result) button above to access the site calc it would be much easier for people to check your anwer.

Like this.

$${\sqrt{{\mathtt{128\,745}}}} = {\mathtt{358.810\: \!534\: \!962\: \!394\: \!882}}$$