javascript indicate a number code example

Example 1: js int

var myInt = 69420

1+1//int
1+"1"//string

Example 2: primitive numbers javascript coding sample increas by 1

function test_prime(n){
  if (n===1) {
    return false;
  }else if(n === 2){
    return true;
  }else{
    for(var x = 2; x < n; x++){
      if(n % x === 0){
        return false;
      }
    }
    return true;  
  }
}

console.log(test_prime(37));