What goes up but never comes down?

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

which number am I?

You have to fill the below given grid in a manner that every row and column contains the digits 1 to 6. Also, make sure that the squares that are connected with each other must contains the same digit.

What does this rebus means ?

PROG WORKRESS

There's a day, that comes around once a year.
To celebrate the man, you hold dear.
He gave you life, love and will pick you up if you fall.
When it comes to guys like him, He's the best of all.
Who is he?

What is the next number in this matchsticks series riddle?

Why is the Hole below a Lock?

What is the Surname of Barbie Doll?

We can be boring,Or interesting.
We can be long,Or short.
We can have pictures,Or just words.
Many love us,But many also hate us.
What are we?

Give it food and it will live; give it water and it will die.