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- Log into your WordPress site and you will be presented with the WordPress dashboard
- In the case of multisite, on the top left corner you should be able to see options for the Network Admin and the subsequent site management as shown below

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- In the case of the single site installation of the WordPress site, no such options will be present

- Looking at these options simply within your WordPress dashboard will allow you to determine weather or not your WordPress installation is a single site or multisite