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

Can you count the number of triangles inside a triangle?

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

How many times in a given day, minutes and hour clock comes in a straight line ?

What numbers should go on the bottom line?
3 6 9 15
8 2 10 12
11 8 19 27
19 10 29 39
? ? ? ?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

You walk into a creepy house by yourself. There is no electricity, plumbing, or ventilation. Inside you notice 3 doors with numbers on them. Once you open the doors you will die a particular way. Door No.1 You’ll be eaten by a lion who is hungry. Door No.2 You’ll be stabbed to death. Door No.3 There is an electric chair waiting for you. Which door do you pick?

I am a word that begins with the letter “i.” If you add the letter “a” to me, I become a new word with a different meaning, but that sounds exactly the same. What word am I?

1. What does:
TIM JOB
represent?

2. What does:
MO_ _
represent?

Why Wine Glass Stem is so long?