Why aren't numeric hashes used?

Question

Database

Eliminating Security Issues

Answer 1

Hashes are used to get some unique identifier for some data (string, file, object, etc.). Moreover, the shorter the hash, the more convenient it is to work with it. Obviously, a hash consisting of only numbers must be very long in order to exclude the possibility of two hashes matching for different data sets.
PS. But in general - symbols, numbers - this is just a convention, designations that are convenient for a person. The computer still represents everything in binary. So, if you really want to, you can output the same md5 only in numbers, only at the same time it will look longer (more characters), although the length will not change in binary notation.

Answer 2

How is it not being used? o_o