Typically, value is entered as a cell reference like A1.
Whenvalueis text, the ISTEXT function will return TRUE.
If value is any other value, ISTEXT will return FALSE.
When values are concatenated, the result is text.
This includes numbers, dates, times, errors, and formulas that do not return text.
ISNONTEXT also returns TRUE when a cell is empty.
For example, if A1 contains “apple”, ISBLANK(A1) returns FALSE.
ISEVEN will return the #VALUE error if a value is not numeric.
When a cell contains a formula ISFORMULA will return TRUE regardless of the formula’s output or error conditions.
ISODD will return the #VALUE error if a value is not numeric.
ISREF Function
The Excel ISREF returns TRUE when a cell contains a reference and FALSE if not.
you could use the ISREF function to check for a reference in a formula.
