The largest known PRIME number has 22,338,618 digits!!

It was confirmed on January 7th of 2018.

The number is 

274,207,281 - 1

274,207,281 is not a prime number.

It is an even number because all the 2’s are multiplied together.

The last digit of 274,207,281 is 2.

The new prime number is 274,207,281- 1.

So the last digit of the new largest prime number is 2-1 = 1