16.04: File with no hardlink

I have a directory with these files on an Ubuntu 16.04 server:

-rwxrwxrwx 1 nobody nogroup   162034 Apr  1  2019 accounts.log
-rwxrwxrwx 1 nobody nogroup  2336191 Apr 17  2019 app.access.log
-rwxrwxrwx 1 nobody nogroup   109801 Apr 17  2019 app.error.log
-rwxrwxrwx 1 nobody nogroup  5530832 Mar  2 16:00 blocs.log
-rwxrwxrwx 1 nobody nogroup     8728 Mar  2 16:14 access.log
-rwxrwxrwx 0 nobody nogroup     9337 Mar  2 15:15 access.log.1
-rwxrwxrwx 1 nobody nogroup     9067 Mar  2 15:18 access.log.2
-rwxrwxrwx 1 nobody nogroup 10485699 Mar  2 14:53 access.log.3
-rwxrwxrwx 1 nobody nogroup    60801 Jan  6 09:21 access.log.4
-rwxrwxrwx 1 nobody nogroup    57034 Jan  6 09:22 access.log.5
-rwxrwxrwx 1 nobody nogroup 10485729 Jan  4 17:59 access.log.6

How can access.log.1 have "0" hardlinks ?
How can I delete access.log.1 ? (rm access.log.1 gives me a No such file or directory error) ...