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).
0.0724
163
8.15
135.8333
0.0344
7.4091
815.9091
Yes, 815 divided by 5 is 163. ---------------------------- To be divisible by 5 the last digit must be 0 or 5. The last digit of 815 is 5, which is one of {0, 5}; Thus 815 is divisible by 5. So Yes, 815 is divisible by 5.
0.0086
10.7237
Suppose the principle is Y and the interest rate r. Then Y + 3rY = 815 Y + 4rY = 854 rY = 39 So Y + 3*39 = 815 Y = 815 - 3*39 = 815 - 117 = 698
DCCCXV = 815