Runway length wont be an issue, not if the aircraft is empty. However even empty the aircraft may exceed the max weight the runway and taxiways can withstand. Fire cover may also not be sufficient (although with prior planning this could be overcome).
The 747 is also an extremely wide aircraft, so taxiing around the airfield may also be an issue.
Trump has a helicopter based in PIK - If he ever needs to visit Aberdeen, he can easily fly into PIK then take a helicopter up to Aberdeen. However, now that he is president, he will be less involved with the running of his business.