Question

do humans can also be called primary consumer

Answer 1

Yes , they can be called.
But Humans are categorized as an Omnivore that means they eat both plants ( or plant products) and animals.

So humans are called primary consumer ( because they consume plants) and also secondary consumer ( because they consume animals that eat plants).
They have been given a special status that is Tertiary consumer means the one who is both primary and secondary consumer.