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No, 0600 is the octal representation of the permissions to be set -- in this case, read/write for the owner (in this case root), permissions denied for all other users. This could also be done in character mode, for example chmod -v u=rw <somefile> && chmod -v go-rwx. If you run these commands, and have a read of the manual page (type man chmod into a terminal) you will see what is happening. "u" stands for the current user/owner of the file, "g" the group members of the file, "o" others", and "a" all users.
Alternatively, you can also change file permissions using most graphical file browsers -- for example on the permissions tab in KDE's Konqueror.
The most useful thing to do, honestly, is to a) READ READ READ, and b) play around with your system as much as possible.