You need to read the manual for the functions you’re using as all the information for how to debug is contained there.
$wpdb-query() description is very clear. The return value is:
(int|bool) Boolean true for CREATE, ALTER, TRUNCATE and DROP queries. Number of rows affected/selected for all other queries. Boolean false on error.
As mentioned in answers to your previous questions, you probably want something like $wpdb->getvar(), which returns one scalar value from a query.
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