Running on. Creeping?

I just bought my first ever Atv. 2003 Sportsman 500. Looked to be in good shape. Low mileage of 1400 km for that year. Anyway my son drove it a bunch yesterday and reports it won’t stop running when he tries to come to a stop. And really hard to get out of gear. Is this a belt problem. The belt has never been changed according to the previous owner. Or is it a clutch issue. Looking for a sequence of things I can do or check in order of simplest first. Hope you can help. Hope my first atv isn’t a dud.

Running on. Creeping?

I just bought my first ever Atv. 2003 Sportsman 500. Looked to be in good shape. Low mileage of 1400 km for that year. Anyway my son drove it a bunch yesterday and reports it won’t stop running when he tries to come to a stop. And really hard to get out of gear. Is this a belt problem. The belt has never been changed according to the previous owner. Or is it a clutch issue. Looking for a sequence of things I can do or check in order of simplest first. Hope you can help. Hope my first atv isn’t a dud.