const isPrime = (number) => {
  if (number <= 1) {
    return false
  }

  for (let i = 2; i <= number / 2; i++) {
    if (number % i == 0) {
      return false
    }
  }

  return true
}

const summationOfPrimes = (number) => {
  let sum = 0
  for (let index = 1; index <= number; index++) {
    if (isPrime(index)) {
      sum += index
    }
  }

  return sum
}

console.log(summationOfPrimes(2 * 1000000))