In MVVM, is every ViewModel coupled to just one Model?

Question

In an MVVM implementation, is every ViewModel coupled to just one Model?

I am trying to implement the MVVM pattern in a project but I found

Answer 1

just use the User model in your view

public partial class User : Login
{
    public string Password { get; set; }

    public List customer { get; set; }
}

in this the another model login inherited and the customer model also used in this model..