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

Living above a star, I do not burn
Eleven friends and they do not turn
I can just be visited in a sequence, not once or repeatedly
PQRS are my initials
Can you tell my name accurately?

Get total of 120 by using five zeros 0,0,0,0,0 and any one mathematical operator.
Do you ?

Replace all '*' with digits 1, 2, 3, 4, 5 and 6 to make below statement true.

* *
x *
=====
* * *

What does below Rebus mean ?

esgg sgeg gegs gsge

How many sides does a circle have?

In the following picture, E is going to slide the object down and as per the terrain and the physics, the round object is going to travel all the way till the end. Now, can you analyze who all people will die when it happens?

Here is a conversation between a couple who both are software professionals.

Husband: Hey! What is your date of birth?
Wife Replied Angrily: It is 591062400
Husband after doing some calculations replied, "Got It".

What is the DOB of the wife?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

You are given four results as below:
1111 = F
2222 = E
3333 = T
Then, can you find out how to code 4444?