login to mysql to see what databases are there.

mysql -u root -p

mysql> show databases;
+----------------------+
| Database             |
+----------------------+
| information_schema   |
| DatabaseXY           |
| DatabaseXYZ          |
| mysql                |
| phpmyadmin           |
+----------------------+
7 rows in set (0.00 sec)

information_schema, mysql and phpmyadmin are system „internal“ databases (where the MySQL users etc.) are stored. They are created per default.

admin