2.91 is not an integer because it is not a whole number
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291 months would be 24.25 years (or 24 yrs and 3 months).
an integer plus and integer will always be an integer. We say integers are closed under addition.
291/625
If the integer subtracted is smaller than or equal to the first integer, then the answer is positive. Otherwise, if the integer subtracted is larger, then the answer is negative.
It is not an integer, nor can it ever be an integer. It can, however, be rounded to the nearest integer, in which case 0.1 will round to 0 to the nearest integer.