# Math.sqrt() Function in Java

**Description:** `Math.sqrt()`

method returns the square root value of the primitive data type. If a number is less than zero, it will return `NaN`

.

## Signature:

```
double sqrt(double d)
```

## Parameters:

Contains primitive data type.

## Return Value:

Returns the square root of argument.

Example:

```
public class Math {
public static void main(String[] args) {
double a = Math.sqrt(9); //calculates square root of 9
double b = Math.sqrt(2456.7); //calculates square root of 2456.7
double c = Math.sqrt(-4568); //calculates square root of -4568
System.out.println("Math Square root value :" + a);
System.out.println("Math Square root value :" + b);
System.out.println("Math Square root value :" + c);
}
}
```

Output:

```
Math Square root value: 3.0
Math Square root value: 49.565108695532984
Math Square root value: NaN
```

Source: Math.sqrt()