<!DOCTYPE html>
<html lang="en-US">
<body>
<h1>JS Prime Number</h1>
<script>
var num = 7;
var i = 1;
var count = 0;
do {
if(num % i == 0)
count++;
i++;
}while(i<= num);
if(count == 2)
document.write(num +" is a prime number");
else
document.write(num +" is not a prime number");
</script>
</body>
</html>