It is, but not evenly.
You get a number with digits after the decimal point.
3998 + 5556 = 9554
Nine is dividable by nine. The answer would be 1.
No. 3,845 is not evenly divisible by nine.
No. 159 is not evenly divisible by nine.
No. 5,129 is not evenly divisible by nine.
No. 69,279 is not evenly divisible by nine.
No. 2,618 is not evenly divisible by nine.
No. 12,180 is not evenly divisible by nine.
No. 509 is not evenly divisible by nine.
No. 872 is not evenly divisible by nine.
No. 205 is not evenly divisible by nine.
No. 88 is not evenly divisible by nine.