I am thinking about this question which I believe is a possible GRE question.
"Which of the following numbers is exactly divisible by 32?
A) $1.9 \times 10^5 $
B) $1.9 \times 10^6$
C) $1.9 \times 10^4$ "
In this case I believe that if x is a non-zero integer then $x \times 10 ^n$ is exactly divisible by $2^n$.
My question is this: Is this a good question for GRE students?