Error ERROR 1045 (28000) in the MYSQL

im install mysql inthe centos 6.7 now but when set password received error

chkconfig mysqld on
[root@CentosFac ~]# service mysqld start
Starting mysqld:                                           [  OK  ]


mysqladmin -u root password
mysqladmin: connect to server at 'localhost' failed
error: 'Access denied for user 'root'@'localhost' (using password: NO)'