What is the last digit of the number

Question

4^2006

Answer 1

4^1= 4
4^2 = 16
4^3 = 64
4^4= 256
4^5 = 1024

You see a pattern?

4,6,4,6,4

every time the power is odd, it ends with 4

every time the power is even, it ends with 6

2006 is even, so the last digit is 6