# Manuals/calci/ISNUMBER

**ISNUMBER(n)**

- is the number

## Description

- This function is one of the group in .
- The is also known as data information functions, data inspection functions or data-testing functions.
- is used to test given value is number or not.
- This function gives the result as TRUE when the given value is the number otherwise this function gives th result as FALSE.
- This function will not convert any numbers from text.
- For e.g. "20" is normally converted as a number 20. But in ISNUMBER("20") will return FALSE, because "20" will not convert in to number.

## Examples

- ISNUMBER(2)=TRUE
- ISNUMBER(0)=TRUE
- ISNUMBER(-100)=TRUE
- ISNUMBER(y)=NULL
- ISNUMBER($)=FALSE
- ISNUMBER("17")=TRUE