# JavaScript Program to find Composite Number

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## What is Composite Number?

A positive integer that has at least one divisor other than 1 and itself.

Tips: It is recommended to use our online Composite Numbers calculator for better understanding.

## Examples

The following table provides few examples of composite numbers.

NumberDivisorResult
131, 13Not a Composite Number
151, 3, 5, 15Composite Number
471, 47Not a Composite Number

## Using for loop

In the following example, we will check whether the number 12 is a Composite number or not using for loop.

### Example

HTML Online Editor
<!DOCTYPE html> <html> <body> <h1>JS Composite Number</h1> <script> var num = 12; var i; var count = 0; for(i=1; i<=num; i++) { if(num % i == 0) count++; } if(count > 2) document.write(num +" is a composite number"); else document.write(num +" is not a composite number"); </script> </body> </html>

## Using while loop

In the following example, we will check whether the number 12 is a Composite number or not using while loop.

### Example

HTML Online Editor
<!DOCTYPE html> <html> <body> <h1>JS Composite Number</h1> <script> var num = 12; var i = 1; var count = 0; while(num >= i) { if(num % i == 0) count++; i++; } if(count > 2) document.write(num +" is a composite number"); else document.write(num +" is not a composite number"); </script> </body> </html>

## Using do while loop

In the following example, we will check whether the number 12 is a Composite number or not using do while loop.

### Example

HTML Online Editor
<!DOCTYPE html> <html> <body> <h1>JS Composite Number</h1> <script> var num = 12; var i = 1; var count = 0; do { if(num % i == 0) count++; i++; }while(i<= num); if(count > 2) document.write(num +" is a composite number"); else document.write(num +" is not a composite number"); </script> </body> </html>

## Composite Numbers between the Given Range

In the following example, we will find all the Composite numbers between 1 and 10.

### Example

HTML Online Editor
<!DOCTYPE html> <html> <body> <h1>JS Find All Composite Numbers</h1> <script> var start = 1; var end = 10; var count = 0; var i = 1; var txt = ""; document.write("Composite Numbers between "+start+" to "+end+":"); for(start=start; start<=end; start++) { for(i=1; i<=start; i++) { if(start % i == 0) count++; } if(count > 2) txt += start + ", "; count = 0; } document.write("<br>" +txt); </script> </body> </html>

## Check Whether the Number is Prime or Composite

In the following example, we will check whether the number 12 is a Prime number or Composite number.

### Example

HTML Online Editor
<!DOCTYPE html> <html> <body> <h1>JS Prime Number or Composite Number</h1> <script> var num = 12; var i; var count = 0; for(i=1; i<=num; i++) { if(num % i == 0) count++; } if(count == 2) document.write(num +" is a prime number"); else document.write(num +" is a composite number"); </script> </body> </html>

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