Easy way to check it is to measure its electrical resistance. That is, if you know your way around a multi-meter. You don't have to remove the element from the tank for this test.
Disconnect one of the wires that connect to the element, and with the multi-meter set to measure OHMS, low end of the scale, touch the probes to the two connection points on the element. If the meter shows around 15 ohms, more or less, the element is most likely OK. If the resistance is much higher the overheat cycle might have damaged the heating element.
Or just fill it up with water and try it out. I'd still buy a replacement, because you may have at least shortened its life.
2011 Dodge Ram 1500 HEMI Quad Cab
2011 Jay Flight 26BH