Run the top or uptime commands:

$ uptime

 19:36:03 up 5 days,  9:12,  8 users,  load average: 0.05, 0.16, 0.21

$ top -bn1 | head -1

top - 19:36:07 up 5 days,  9:13,  8 users,  load average: 0.05, 0.16, 0.21

The load averages stated here are:

/proc/loadavg

          The  first  three  fields  in this file are load average figures

          giving the number of jobs in the run queue (state R) or  waiting

          for disk I/O (state D) averaged over 1, 5, and 15 minutes.  They

          are the same as the load average numbers given by uptime(1)  and

          other  programs. 

Consider my load averages: 0.05, 0.16, 0.21

That means, over the last minute, on an average, 0.05 processes have been waiting for resources.

Should you be worried that the load average is 2? In general, if the load average is greater than the number of CPUs available, then some process had to idle around waiting for a CPU slot.

If the load average is less than the output of nproc, you don't need to worry.

Also see: What does load average mean in unix/linux?
As Braiam notes, the processes need not be waiting only for CPU: Understanding load average vs. cpu usage