Yes, those are clearly spammers. There are a number of things we do behind the scenes to prevent spammers being able to register but occasionally some get through. There's nothing to worry about however, all new members have their content and actions moderated until they are shown to be genuine members.
If any spam content is posted it can also be reported. There are some automated actions so that if a number of people report the same content it is automatically hidden to be dealt with by a moderator.