Question

Is 9.561 a repeating decimal?

Answer 1

Not the way you wrote it, it isn't.  Nothing you wrote is repeated, and
there's no note saying that the  561,  or the  61,  or the  1  repeats.

Answer 2

No it is only a repeating decimal if the number is repetitive for example .3333333 is a repeating decimal because the 3 repeats with no change of pattern