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

There is an English word that can be used up to four times in a row without modifying the spelling and form a valid grammatical sentence.

Do you know what word is that?

If you read clockwise, you can form a word by inserting three missing letters in the picture given below. Can you do it?

I am 5 letters long.
My first two tell you who I am
My first 3 could be a medicine
My last three reversed could be a young boy.
My 4th, 3rd and 2nd in that order could be a fruit drink.
If you have me you may hang me round your neck
WHAT AM I ?

How many triangles can you find in this given picture?

The following "Brain Bat" means Slow Down.
S
L
O
W

Using the same logic, can you tell us what does the following Brain Bat means ?
E
V
I
G

What is the riddle which can be asked all day with a different correct answer each time.

What month of the year has 28 days?

There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?