Yes, aluminum lug nuts can be torque. Torque is the amount of force required to turn or rotate an object. The units for torque are usually foot-pounds (ft-lbs) or Newton-meters (Nm). When tightening lug nuts, it's important to use the correct torque setting. If they're too loose, the wheels may come off while driving; if they're too tight, the lugs may strip the threads or break.
Aluminum lug nuts are softer than steel ones, so they're more susceptible to stripping. That's why it's important to use a lower torque setting when tightening them. For most applications, a good rule of thumb is to use about half the torque that you would use for steel lug nuts. So, if your vehicle's owner manual says to tighten the steel lug nuts to 100 ft-lbs, you would only tighten aluminum ones to 50 ft-lbs.
If you don't have a torque wrench, it's better to err on the side of caution and go with a lower setting. Many hardware stores sell small click-type torque wrenches that are easy to use and relatively inexpensive.