# JavaScript code to check whether a Number is Prime or Not

In this JavaScript code, we are going to check whether a given number is prime number or not.
Submitted by Aleesha Ali, on March 25, 2018

Prime: When a number can be divide by one (1) or itself then the number is Prime number.

Example: 2 3 5 7 11 ... etc.

## JavaScript code to check whether a Number is Prime or Not

```<script>
function Prime()
{
var i,flag=0,number;
number = Number(document.getElementById("N").value);

for(i=2; i <= number/2; i++)
{
if(number%i == 0)
{
flag = 1;
break;
}
}
if(flag == 0)
{
}
else
{
window.alert(number+"-The inputted number is not Prime");
}
}
</script>
```

Calling JavaScript function in HTML (HTML, JS Code)

```<html>
<script>
function Prime()
{
var i,flag=0,number;
number = Number(document.getElementById("N").value);

for(i=2; i <= number/2; i++)
{
if(number%i == 0)
{
flag = 1;
break;
}
}
if(flag == 0)
{
}
else
{
window.alert(number+"-The inputted number is not Prime");
}
}
</script>
<body>
<br>
<h1>Whether a number is Prime or not</h1>
Enter The Number :<input type="text" name="n" id = "N"/>
<hr color="cyan">
<br>
<center><button onClick="Prime()">CHECK</button>
</body>
</html>
```

Output