Are git hooks pushed to the remote when I 'git push'?

No, git hooks are not pushed or pulled, as they are not part of the repository code.

Please refer to the documentation for a list of simple client-side and server-side hooks.

If you want to enable some hooks for all clients that clone or pull from a given repository, you have to add the hooks to your codebase and then create your own script to copy them into, or link to them from repo/.git/hooks/.

No. Hooks are per-repository and are never pushed. Similarly, the repo config isn't pushed either, nor is anything in .git/info, or a number of other things.

Pushing and pulling only exchanges branches/tags and commit objects (and anything reachable from a commit, e.g. trees, blobs).