When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

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

A man calls his dog from the opposite side of a river. The dog crosses the river without a bridge or a boat and manages to not get wet. How is this possible?

Can you count the number of matches in the picture below ?

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?

In a town, there are over 100 flats.
Flat-1 is named first flat.
Flat-2 is named second flat.
Flat-3 is named third flat.

A visitors 'Victor' decides to walk through all the flats, he finds all the flats except flat-62.
Victor later founds that the local of the town have given it another name.

What is the name of the Flat?

How many triangles are there on the puzzle below?

I am first found in caves, now prolific online; I am a depiction, a drawing, a symbol, or sign. I will convey whichever mood you could wish; or for that matter, a fist, flask, or fish. What am I?

Can you divide the below-given shape into four equal and identical pieces?

A donkey is behind another donkey
I'm behind that second donkey
But there is a whole nation behind me

It is a murder you can describe in a word.