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The urlpatterns starts at the top and then goes down until it matches a URL based on the regex. In order for Django to serve up the page located at otherpage.html there has to be a URL defined in urlpatterns that matches otherpage.html otherwise you will get the 404.
In this case you have:
url(r'^$', 'prd.views.home', name='home'),
url(r'^$', 'prd.views.otherpage', name='otherpage'),
Note that nothing will ever get to otherpage here because home has the same pattern (regex) and will therefore always match first. You want to have a different URL for both those so that you can differentiate between them. Perhaps you could do something like:
url(r'^$', 'prd.views.home', name='home'),
url(r'^otherpage.html$', 'prd.views.otherpage', name='otherpage'),
After making this change you now have a match for otherpage and hopefully no more 404.
EDIT:
url(r'^otherpage.html$', 'prd.views.otherpage', name='otherpage'),
This matches www.example.com/otherpage.html but it will not match www.example.com/otherpage
To match www.example.com/otherpage you need to use:
url(r'^otherpage$', 'prd.views.otherpage', name='otherpage'),
Note the difference in the regex, there’s no .html here. The regex matches exactly what you put in it.