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What is meant by "rotate 13" in "/etc/logrotate.conf" file? Can this be changed to "rotate 4" ?

$ cat /etc/logrotate.conf
    # see "man logrotate" for details
    # rotate log files weekly
    weekly
    # keep 4 weeks worth of backlogs
    rotate 13
This statement keeps 13 weeks worth of the logs.

'rotate' means that it keeps the old logfiles for as many cicles as specified. (A cycle is in your case a week)
From the documentation at https://linux.die.net/man/8/logrotate
  
rotate count
  
Log files are rotated count times before being removed or mailed to the address specified in a mail directive. If count is 0, old versions are removed rather than rotated.
The rotate command determines how many archived logs are returned before logrotate starts deleting the older ones.
You can read more about it here and here.
        
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