Well, it seems to me that 6,000,000 is probably not the correct number. Given Einstein is the most famous theoretical physicist that ever lived and was not too shabby in math, I suspect he never actually said this unless it was an off the cuff remark made to illustrate some point at a cocktail party or some such thing.
It almost certainly wasn't something he declared to the world after running the numbers.
It almost certainly wasn't something he declared to the world after running the numbers.