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