Check if a number is multiple of another number in JavaScript

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

Consider, we have a following number:

const num = 10

To find if a above number 10 is a multiple of another number, we should divide the first number by second and get the remainder 0 then only we call it’s a multiple of another number otherwise it is not a multiple.

For example: 10%2 = 0

Using the % Modulo operator

To check if a number is a multiple of another number, we can use the % modulo operator in JavaScript.

The modulo % operator returns the remainder of first number by second number eg: 10 % 2 = 0, so if we get a remainder 0 then the given number is a multiple of another number otherwise it not a multiple.

Here is an example:

const num = 10;

if (num % 2 === 0) {
  console.log("10 is a multiple of 2");
}else {
  console.log("10 is not a multiple of 2");
}

Output:

"10 is a multiple of 2"

In the above code we have added 10 % 2 === 0 in if condition. so if 10 is divided by 2 and returns the remainder 0 then it prints the output “10 is a multiple of 2”.

Example 2 :

if (20 % 2 == 0) {
  console.log("20 is a multiple of 2");
}else {
  console.log("20 is not multiple of 2");
}

Output:

"20 is a multiple of 2"

Checking if a number is not multiple of another

To check if a number is not a multiple 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 % 2 != 0){
    console.log("35 is not a multiple of 2");
}

In the above code, 35 is divided by 2 and returns the remainder 5. So 35 is not multiple of 2.