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If I have an abstract ViewModel (VM-A), which is inherited by child ViewModels (VM-B,C,D), is that ViewModel (VM-A) considered a model of ViewModels?
Example: VM-A is a “Shape” class contains x number of common properties, with abstract Calculate() method.
VM-B is a “Circle” class, inheriting VM-A, and the overrides Calculate to perform its own calculations using the common properties.
Is VM-A considered a Model at that point?
No, it is considered a base ViewModel. The concept Model refers to either a domain model which represents the real state content (an object-oriented approach), or the data access layer that represents that content (a data-centric approach).