# isPrime
> Test if a number is a prime.
A **prime number** is defined as an integer value greater than `1` which is only divisible by `1` and itself.
## Usage
```javascript
var isPrime = require( '@stdlib/math/base/assert/is-prime' );
```
#### isPrime( x )
Tests if a number is a prime.
```javascript
var bool = isPrime( 7.0 );
// returns true
```
## Examples
```javascript
var isPrime = require( '@stdlib/math/base/assert/is-prime' );
var bool = isPrime( 11.0 );
// returns true
bool = isPrime( 3.14 );
// returns false
bool = isPrime( NaN );
// returns false
```