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For Drupal 7: Domain access would make more sense and you could share content between sites as well as views, themes, styles, modules.
In 8 Group (not organic groups) uses a domain access feature as well (a separate module).
You mentioned multisite in the title which is another option (share code, separate dbs).
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This is difficult, because it is core functionality.
What you could do to prevent people from checking node/4, node/5 etc is blocking access when a url request has a certain structure. You'd need a custom module with an EventSubscriber.
Here is an example how to intercept such url requests and how to redirect them. In this case it is a taxonomy term view but ...
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