Not unless its a surround amp, with surround inputs (auxiliary or pre-amp (front/ back inputs) and usually, unless the Pc has separate jack outputs for surround Front/ back minimum.) Some might allow it in a particular mode of output select-able from the sound cards software. However, some sound card software is not model specific, and may show output modes your particular PC is not equipped (have jacks) for. Most Laptops, for example are only one jack systems (stereo). Many 5.1 sound cards will have two jacks, one for front out, one for rear out, and a third for a microphone or Sub-bass out select-able from the card's menu. You may still use synthesized surround modes on the amplifier to derive some rear channel information Obviously, and by definition you cannot get five channel sound from a two channel (stereo) amplifier.
Not to be confusing, but there were, back in the day, circuits that would divert sounds common to both front stereo channels from the front speakers to rear speakers , expecting these sounds to be echos, ect, in the stereo signal. however this is not modern Surround, which dedicates a true recorded signal through a dedicated amplifier, one for each speaker. It was a primitive synthesizing method enhanced by speaker poling and is not used to record surround sound.