Sounds likely. You can look in the logs for that day with highest hits and see what the activity detail was: in the "Information" column it will have the site name for front page hits and the various course names for when the activity is in the courses. If you see a spat of high activity at close intervals from same IP address, a spambot is likely. Good thing self-registration is off.
Analytics and reporting
Guests showing up on reports
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