ISBLANK(A1) is a boolean function that returns TRUE if the cell (A1 in this case) has anything in it and FALSE if it's empty.
ISNUMBER(A1) is similar (a boolean that checks what's in a cell), but it looks for whether the cell contains a number.
Both are "information" type functions.
If you want to check whether a cell contains an integer, as opposed to a real number, then I'd suggest something like, IF(A1-INT(A1) > 0, 'what do if true', 'what do if false') ; but someone else might know a more elegant approach.
So ultimately:
That work???
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