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# Math.sqrt()

The **`Math.sqrt()`** function returns the square root of a number.

## Syntax

```js
Math.sqrt(x)
```

### Parameters

- `x`
  - : A number greater than or equal to 0.

### Return value

The square root of `x`, a nonnegative number. If `x < 0`, returns `NaN`.

## Description

Because `sqrt()` is a static method of `Math`, you always use it as `Math.sqrt()`, rather than as a method of a `Math` object you created (`Math` is not a constructor).

