The first 2 is CAS Latency Control (tCL).
The second 2 is RAS# to CAS# Delay (tRCD).
The third 2 is Row Precharge Timing (tRP).
The 5 is Min RAS# Active Timing (tRAS).
This site explains what all of that is about
As for your dual channel question, yes, I do believe you can put dual channel RAM in a motherboard that does not support dual channel RAM. The only thing is, is you put it in a motherboard that DOES support dual channel, it will run a heck of a lot better.