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

Can you decipher these quotes by Albert Einstein?
Blf xzm mvevi hloev z kilyovn lm gsv ovevo lm dsrxs rg dzh xivzgvw.

At a bar, three friends, Mr Green, Mr Red and Mr Blue, were having a drink. One man was wearing a red suit; one a green suit; and the other a blue suit. 'Have you noticed,' said the man in the blue suit, 'that although our suits have colours corresponding to our names, not one of us is wearing a suit that matches our own names?' Mr Red looked at the other two and said, 'You're absolutely correct. What colour suit is each man wearing?

Take away the whole and some still remain. What is it?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

Two brothers were watching a horror film on video late one night. One brother dozed off and dreamed that he was being chased by the crazy man from the movie, who was trying to kill him. In the dream, he hid in a cupboard. There was no sound except his heart pounding, and he had no idea where his crazed captor was. He was terrified! At that moment, the video finished, and his brother put his hand on the shoulder of his sleeping sibling to wake him. The shock at that tense moment was enough that the sleeping brother suffered a massive heart attack and died instantly. True or false?

If all Goats are Sheep and all Sheep are Deers, are all Deers Goats ?

What does below science rebus mean?

Ag Ag Ag
Ag SPOON Ag
Ag Ag Ag