Long Doge Challenge

Failed to realize doge prime was supposed to only count prime-numbered wows until after looking at the game's code.

From the game's script:

  function isFibonacci(numberToCheck) {
    return (
      isSquare(5 * numberToCheck * numberToCheck + 4) ||
      isSquare(5 * numberToCheck * numberToCheck - 4)
    )
  }

How does that end up working for all numbers?