//set up a prime number function
function primeNumberGen(param){
  if(param === 1){
    return false;
  }
  if(param === 2){
    return true;
  }
  if(param % 2 === 0){
    return false;
  }
  var ceil = Math.ceil(Math.sqrt(param));
  for(var i = 3; i <= ceil; i += 2){
    if(param % i === 0){
      return false;
    }
  }
  return true;
}

//test if primeNumberGen works
console.log(primeNumberGen(17));
console.log(primeNumberGen(18));

//function to loop to count primes
function sumPrimes(param){
  //array to collect data
  var array = [];
  //start the loop
  for(var j = 2; j <= param; j++){
    //identify primes and push to array
    if(primeNumberGen(j)){
      array.push(j);
    }
  }
  //function to sum array
  var sumArray = array.reduce(function add(a,b){
    return a + b;
  }, 0);
  //function to return answer
  var answer = function(){
    return sumArray;
  }
  //return answer
  return answer();
}

//return final answer with function
var answer = function(param){
  return sumPrimes(param);
}

//test if it works
console.log(answer(10)); //test example should be 17
console.log(answer(2000000)); //final answer should be 142913828922