# Check if a number is divisible by another number in JavaScript

In this tutorial, we are going to learn about how to check if a number is divisible by another number in JavaScript with the help of examples.

Consider, we have a following number:

`const x = 30`

To find if a above number `30`

is divisible by another number, we should divide the first number by second and get the remainder 0 then only we call it’s a divisible of another number otherwise it is not a divisible.

For example: 30%5 = 0

## Using the % Modulo operator

To check if a number is divisible by another number, we can use the `%`

modulo operator in JavaScript.

The modulo `%`

operator returns the remainder of first number by second number eg: `30 % 5 = 0`

, so if we get a remainder `0`

then the given number is a divisible of another number otherwise it not a divisible.

Here is an example:

```
if (30 % 5 == 0) {
console.log("30 is divisible by 5");
}else {
console.log("30 is not divisible by 5");
}
```

Output:

`"30 is divisible by 5"`

In the above code we have added `30 % 5 == 0`

in if condition. so if 30 is divided by 5 and returns the remainder 0 then it prints the output “20 is divisible by 5”.

Example 2 :

```
if (100 % 10 == 0) {
console.log("100 is divisible by 10");
}else {
console.log("100 is not divisible by 10");
}
```

Output:

`"100 is divisible by 10"`

## Checking if a number is not divisible by another

To check if a number is not a divisible of another number, we can use the modulo operator `%`

but the remainder of first number by second number is not equal to 0.

Here is an example:

```
if (35 % 10 != 0){
console.log("35 is not divisible by 10");
}
```

In the above code, 35 is divided by 10 and returns the remainder 5. So the given number is not divisible of 10.