What is the last digit of 8627 to the power of 5515 when multiplied out?
Note the last digit pattern for powers of 7
7^1 = 7
7^2 = 9
7^3 = 3
7^4 = 1 and this pattern repeats
So 5515 mod 4 = 3
This indicates the 3rd entry in the pattern = 3 = ending digit