# isNumeric {#isnumeric}

**Parent topic:**[Functions](../../Functions/category.md)

## Syntax {#syntax}

`isNumeric(X)`

## Arguments {#arguments}

**X** is a STRING scalar or vector.

## Details {#details}

Return true if all characters in the string are numbers. For null values of the STRING type, return false.

## Examples {#examples}

```
isNumeric("123456");
// output: true

isNumeric("1And1");
// output: false

isNumeric("10.05");
// output: false

isNumeric(string());
// output: false
```

