Chainfire is a Very Reputed Developer when it comes to Rooting Samsung devices. His SuperSU App is known and used by almost every Root user, and like he does with the Root package files, he has made the Galaxy Note 4 Root available ahead of the Official Note 4 Worldwide launch.
The Galaxy Note 4 is now exclusively on Sale in Korea, though it will be available worldwide soon. This allows some people to get their hands on the device first, and this has helped Chainfire get the Root files together. The root method currently works on the SM-N910C and SM-N910U with Exynos 5433 and the SM-N9106W launched in China with the Snapdragon 805 chipset; More varients will be added to the list soon including carrier devices according to Chainfire. The Samsung Galaxy Note 4 can be rooted by flashing the CF-Auto-Root package using Odin. The tool will install SuperSU on your device before restoring the stock recovery to allow you to gain root access on your smartphone in a just a few minutes. This is the method used on current flagships like the S5 or Note 3 to gain root access.
You can check out XDA-Developers Forum for the necessary tools to root your Galaxy Note 4. Before continuing please keep in mind that rooting or flashing ROMs involves some risk and would usually void your warranty and makes the Knox counter 0x1. For those of you who are new to rooting, Knox warranty is a single-time programmable e-fuse, which goes off if you root the device or flash a non-stock firmware, kernel, etc. At the moment, there’s no way to reprogram that e-fuse and prevent the Knox warranty from being voided. If you Knox counter is 0x1, you won’t technically have warranty.So, continue with the process only if you are sure about what you are doing.