Its bashed out.
Look at your new one, you will see its got straight cut splines on it to grip the hub.
The new one is placed in through the rear (same way as the old one went out) and you can either hammer it in or as in my cases i put some washers where the wheel sits, fit the nut upside down (flat side faceing the hub) and tighten the nut real tight which will pull the stud in. Sometimes a little hammering from the rear helps take the strain off the nut as you dont want to break the new one too.
Bash it in if you can get to it, pull in in with the nut if you cannot.
Did the last person to put the wheel on cross thread it for you ?
You can get new studs at most auto stores, take your broken bits with you and a nut for thread matching.
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