Failed root logins

Should I be concerned with this?

I got a logwatch email from my server and one of the entries read.....

--------------------- SSHD Begin ------------------------


Failed logins from these:
root/password from 222.237.79.237: 16 Time(s)

and

--------------------- pam_unix Begin ------------------------

sshd:
Authentication Failures:
root (222.237.79.237 ): 16 Time(s)

 

 

 

 

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