No, there is no root required to play it. Any Android device with required specifications can easily handle Clash of Null. There is no need to root your device either. We personally are against such apps that require rooted devices. Please do not root your device to do so. Better use safe apps and if you wish to download third-party or modified apps or Clash of Clans Private Servers, make sure you download them from trusted websites like NullsClash.net.