This function tests whether a value, an expression, or contents of a reference cell is a formula.
ISFORMULA(reference)
Specify the cell reference for the argument.
This function returns FALSE if the value refers to an empty cell or to no data.
This function is used to test the contents of a cell.
Accepts cell reference for argument. Returns Boolean (TRUE or FALSE) data.
ISFORMULA(B4) returns false, where B4 is a cell reference with a numeric value 56.