The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

It spends most of its day eating white, but when it’s quick enough, it gets to eat fruit and sometimes some blue things. It’s in a dark room, where the walls are blue, it runs from a ghost that roams the halls and haunts it all the time. What is it?

I am a five-letter word and people eat me. If you remove the first letter I become an energy form. If you remove the first two letters, I am needed to live. Scramble the last three letters and I am a drink. What word am I?

Yesterday I fell from 30 feet high ladder but I don't get hurt. Why?

A man is lying dead in a field where no one is around. His head is split open and his legs are disfigured. Near to him, there is an unopened package. No living organism can be found anywhere at the crime scene.

How did he die?

I am under you when I am whole.
I shift above you if you remove the first letter.
I come all around you if you remove the second as well.

Can you tell me who I am?

2, 3, 5, 9, 17, _ What is the next number in the sequence?

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

What country can make you shiver?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?