Yes. Calendars can be displayed side by side. Microsoft recommends no more than 10 for optimal viewing. These need to be calendars that you either have permission to view (shared calendars) or additional calendars of your own.
You can click in the checkbox beside the calendar in Calendar mode or select 'Open a Shared Calendar' and then click the checkbox.
To see a calendar in its own window, right-click on the calendar you want to see and select 'Open in a New Window.'