What does the below rebus riddle means?

In two decks of cards, what is the least amount of cards you must take to be *guaranteed* at least one four-of-a-kind?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

John killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

What does Alexander the Great and Winnie the Pooh have in common?

If eleven plus two equals one, what does nine plus five equal?

How many Watermelons are there in the below picture?

There is a unique number which when multiplied by any number from 1 to 6, we will get the new number that contains the same digits only.

Can you find that number?

I have four wings but can't fly.
I express no emotions.
I am found on the exact spot every time you look.
I keep toiling away with a little sound.

Do you know what am I?

What is the below Rebus indicate?