We will learn in this tutorial **how to square a number in java** . We can **square in java** using multiple methods . First we see what is squaring in java , then we will see example of square in java .

## What is the square of a number?

In mathematics or algebra, you can calculate the “square” of a number, by multiplying the same number with itself.

Example : the square of 2 is (2*2=4)4, and the square of 3 is (3*3=9)9.

## How to Square a number In java ?

Now we can square in java using these below methods .

- Square a number by multiplying it by itself
- Square a number using Math.pow function

## 1. Square a number by multiplying it by itself

We can find square in java multiply number by itself . It is very simple method for squaring in java for any number .

```
public class SquareNumber {
public static void main(String[] args) {
int num = 2;
int square = num * num ;
System.out.println("square of num :"+ num +" is :"+ square );
}
}
```

Output :

`square of num :2 is :4`

## Square a number using Math.pow function

We can use Java math.pow() method for squaring in java . In this example of square Math.pow(num, POW) multiply num with itself POW times .

```
public class SquareNumber2 {
public static final Integer POW = 2;
//return square a number
public static Double getSquare(Double num) {
//square a number
return Math.pow(num, POW);
}
public static void main(String[] args) {
double num = 2;
System.out.println("square of num :"+ num +" is :"+ getSquare(num) );
num = 3;
System.out.println("square of num :"+ num +" is :"+ getSquare(num) );
}
}
```

Output :

```
square of num :2.0 is :4.0
square of num :3.0 is :9.0
```

In this tutorial we learned how to square a number in java using multiple methods. squaring in java is frequently ask question in academic exam . So you should try these example of square . You can find more java program for practice .