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

which number am I?

How high do you have to count before you use the letter “a” in the English spelling of the whole number?

I have one of the three numbers: 1, 2, or 3 in my mind. I speak only truth. You can ask me just one question for which I will only reply in yes or no or don't know. What question will you ask from me so that you are able to know the number?

First, think of the colour of clouds. Next think the colour of snow. Last, think of the colour of the moon. Now, what do cows drink?

Which famous Hollywood movie name is hidden in the below rebus?

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135

I am dry when I go inside, but wet when I am pulled outside.
The longer I am inside, the stronger I get
When I am completely out, I am wet and I literally sag
Who am I?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?