Do numbers exist?
Not the visual or verbal symbols for numbers, but numbers themselves?
Numerals, the “visual or verbal symbols for numbers” do exist. As with anything that facilitates understanding, in this case they represent the idea/concept of “quantity”, so that humans may communicate effectively. I suspect that many animals also have a concept of quantity, else how do animal mothers keep track of their offspring…e.g. the mother duck, whose duckling falls down the drain and lingers nearby, or the mother cat or dog who relocates her kittens or puppies.
Numbers are an abstraction, like all of math.
If I write a one on a piece of paper billions of carbon atoms make up that one, there's no one there.
Concepts aren't real in the physical sense, only in the abstract sense.
Like my identity, which brain cell does it reside in? All of them, it's a neural network, so it's not the neurons it's the connections between the neurons. I as a personality I do not physically exist.
There are no souls, there are no numbers.