I Can Delete /var/log/ this folder inside any files

[lung3]

i can delete below files
/var/log/maillog.1
/var/log/maillog.2
/var/log/maillog.3
/var/log/maillog.4
/var/log/messages.1
/var/log/messages.2
/var/log/messages.3
/var/log/messages.4