Excel’s ISNUMBER function is a boolean function that returns TRUE or FALSE if supplied value is a number or not respectively.
It simply take one argument and returns TRUE if its a number else FALSE. Most of the time you will passing references of a cell or a formula as values to check that if its a number or not.
In many tutorial I have used ISNUMBER function to count or find out if a value is a number or not. You can check our articles Check If Cell Contains Specific Text and Count Cells that Contain Specific Text. I have used ISNUMBER function in these articles.
So yeah, this is what ISNUMBER do. Its simple yet powerful if used with other formula smartly.
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