Question

What is the sum of the digits of `2015^2`?

Answer 1

`19`

Explanation:

`2015^2 = (2000+15)^2 = 2000^2+2(2000)(15)+15^2`

`=4000000+60000+225 = 4060225`

So the sum of the digits is:

`4+6+2+2+5 = 19`