mysqladmin is the binary you are looking for. Read MySQL's getting started/installation docs so you are sure there are passwords and everything is setup properly.
You may also see mysql start/stop scripts in init.d
#ls /etc/init.d | grep mysql
If so, you can start it
# /etc/init.d/mysql start
And at boot
# chkconfig --add mysql
That is, if mysql is the name of the init script.