SpaceShipOne was unsafe1, barely met its requirements 2 (which was certainly good enough) and was designed specifically to win the prize.
The tiny passenger compartment meant that there was zero incentive to certify it for passengers; it would certainly have not been economic for tourist flights.
I wouldn't call it a prototype since it was designed to meet certain requirements, met them, and was retired before it killed anybody.
1 "SpaceShipOne had lost control. It spiraled up, making twenty-nine rotations."
2 "To solve the problem that SpaceShipOne barely reached space even when much lighter than it would have been for an Ansari X Prize attempt..."
Source: Burt Rutan's Race to Space, Dan Linehan, 2011