There is free root detect apps from play store......
Make a TWRP back-up(copy to a SD Card) if you want to help keep your setup intact.
or
I'm not sure of your setup, back-up your apps and data with Titanium Back-up to SD Card.( I use uncompressed mode T.B. has issues with this 7.1.2 firmware?)
I would flash again for a clean start, try Magisk root. (Magisk can be funky when later updating, SuperSu can brick when updating(?).)
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