Existing lock /var/run/yum.pid: another copy is running as pid

Existing lock /var/run/yum.pid: another copy is running as pid [number].
Another app is currently holding the yum lock; waiting for it to exit...
  The other application is: yum
    Memory :  23 M RSS ( 37 MB VSZ)
    Started: Sun Jul 10 12:38:40 2016 - 01:08 ago
    State  : Sleeping, pid: [number]

How to fix it?

root# kill -9 [number]

Example:

root# kill -9 5115