Yes it is.
815/5=163
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163
Yes.
DCCCXV = 815
They can both be divided by any number except zero; the result will usually not be a whole number. If you mean what numbers divide exactly into them, ie what are their factors: The factors of 815 are 1, 5, 163, 815 The factors of 4 are 1, 2, 4 The common factors of 815 and 4 are 1 (only).
The percentage of 530 out of 815 is approximately 65%.