Why does adding a user and setting an SUID for it throws me the "Operation not permitted" error?

I am setting SUID for a new user tommy to run the same commands as root but it goes down like this:

[root@192 ~]# useradd tommy
[root@192 ~]# su - tommy
[tommy@192 ~]$ chmod u+s /usr/bin/ls
chmod: changing permissions of '/usr/bin/ls': Operation not permitted`

Do I need to add this user to sudoers file in order to execute this command successfully or what?