Square Root Trivia

Hi! I'm Ariana and I wanted to share some square root trivia. First of all, did you know the root in root is spelled r-o-o-t? I didn't know that until today. I thought it was r-o-u-t-e, but now I know better. Anyway, here is some trivia:

1. (An easy one) What is the square root of 1?
2. What is the square root of 256?
3. What is the square root of 144?
4. What is the square root of 400?
5. What is the square root of 81?

I know what a square root is, but do you? Along with your answers, post a definition of what a square root is. I'm looking for the very best definition. I'll be back in a few days with the answers.

Thanks,
Ariana