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The studs should be "pressed" into the unit bearing on the axle.
If you are able to move them at all "seperately" from each other then they should be replaced. You might also be looking at getting a new rim because they may have damaged it when they were loose.
If the studs "all move together" when you wiggle one then you are probably looking at a new hub/unit bearing.
Another test you can do is to jack the tire off the ground (with it bolted on) and try to move the tire with your hand. If it moves when you apply pressure at 12 o'clock & 6 o'clock then your bearing is toast. At 3 & 6 only then it may be tie rod end.
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