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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>Testing isPrime</title>
</head>
<body>
</body>
</html>
 
 let isPrime = function(n){
if(n === 2){
return true;
}
if((n < 2) || !(n%2) || !Number.isInteger(n)){
return false;
}
for(let i = 3; i < n - 1; i++){
console.log(n + "%"+i + " = " + n%i);
if(n%i === 0){
return false;
}
}
return true;
}
 
 isPrime(7);
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