You can use the OBJECTPROPERTY() function in SQL Server to check whether an object is a user-defined table or not.
To do this, pass the object ID as the first argument, and IsUserTable as the second argument. The function returns a 1 or a 0 depending on whether or not it’s a user-defined table.
A return value of 1 means that it is a user-defined table, and a value of 0 means that it’s not.