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

What is the coolest letter in the alphabet?

In the given picture, in how many ways can you read the word "Tiger"?

Next Number in the Series,

5, 16, 49, 104, ?

What is harder to catch the faster you run?

In the Chess Board picture below white army is arranged. You need to add a black army on the board such that no piece is under any threat.
Note: Army comprised of 1 king, 1 queen, 2 rooks, 2 bishops, 2 knights, and 8 pawns.

What is the four-digit number in which the first digit is one-third the second, the third is the sum of the first two, and the last is three times the second?

There were five men at church, and it started raining while they were outside. The four that ran still got wet, but the one that was still stayed completely dry. Why did he stay dry?

In a fruit store, there was a unique weighing machine that was made to weigh only cherries and strawberries as they were priced the same.

Other fruits like watermelons or mango had different machines as they were expensive.

A man successfully buys watermelons at the price of cherries. How?

A boy and a girl are sitting on the porch.
"I'm a boy," says the child with black hair.
"I'm a girl," says the child with red hair.
If at least one of them is lying, who is which?