Can you find out which number multiplied by itself will give the output as 12345678987654321?

why number 8549176320 is one of a kind?

What is the end of everything?

What are the next two letters in the following series and why?
W A T N T L I T F S _ _

*Hint: Check Puzzle Title

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

In the image below, you can see two glasses and two matchsticks.You need to move four matchsticks in such a manner that the crosses come inside the glasses. Note: you cannot move the crossed.

As you can see that fifteen matches have been used to form an arrangement. What you have to do is remove any six of them to make them ten.

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

which number am I?

If I put in one canary per cage, I have one bird too many. If I put in two canaries per cage, I have one cage too many. How many cages and canaries do I have?

Why are all black people so quick ?