Soul

[Neo-Scholastic]

I'm not convinced that any specific number doesn't have substantial content since it makes reference to a formal property of material things. However, a unit or a whole defines an immaterial form, i.e. the formal cause that allows specific numbers to exist. (Just an idea with which I'm toying and hoping you can help me flesh out.)

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Great apes and even dogs can perceive the immaterial as well, does that mean they also have souls?

I think the OP is just a set-up. He needs to provide an ontological basis for immaterial entities before he can attribute properties to a specific immaterial entity. If he can show that a specific immaterial entity has the properties normally attributed to a 'soul' then he has made his point.