It won't be a true 4 channel but you can connect two speaker to each channel if you follow some simple rules.
Since the amp is 2 ohm stable, you can wire two 4 ohm speakers in parallel per channel. Both paralleled speakers will need to handle the TOTAL wattage per channel.
That amp is 250 watts RMS @ 2 ohm per channel so each speaker needs to handle at least 125 watts RMS.
This is how each channel will be wired - http://i81.photobucket.com/albums/j230/sparky3489/PARALLEL.jpg