var num=8;
var isPrimeT=true;
var iw=2;
while(iw<isPrimeT){
  if(num%iw==0){
    isPrimeT=false;
    break;
  }
  iw++;
}
if(isPrimeT==false){
  console.log(num+" is not a prime number");
}
else{
  console.log(num+" is a prime number");
}

Is there anything wrong? it does not show the correct answer. When I input the variable "num", it only shows num+"is a prime number".