Is there any way to find out how much RMS power range my subs are?

my brother gave me his old subwoofers which are 2 12's. the brand is Anka, but they discontinued them because it doesn't say anything about subwoofers only accessories on their website and i tried looking up information but i couldn't find anything. on the subwoofer it only says that its 600 watts and four ohms each. i'm trying to by the amp, but don't know which one since i don't know the RMS power range. so is there any way to find out the RMS power range?