Disconnecting the battery is the only reliable way to completely disable the alarm. Even then, the alarm may still activate if the battery is reconnected improperly or if a door is opened and closed with the car still in alarm mode.
If you're having issues with your alarm, it's best to consult a repair manual specific to your 1998 Dodge Grand Caravan or take it to a qualified mechanic to diagnose and fix the problem rather than attempting to disable it through fuse removal. Pulling the wrong fuse could damage other systems in your vehicle.