Is 0.2487 a interger

No. 0.2487 is not an interger.

There are two big reasons for this:

1). There is no such thing as an ' interger ',

so no number could be one.

You probably mean ' integer '.

2). An integer is a whole number ... a number

with no fraction part and no decimal part.

0.2847 is all decimal, and not even big enough

to make the smallest whole number. (That's ' 1 '.)