Apparently hackers are also part-time epistemologists. My general feeling on the issue is that any enterprise that generally uses the scientific method to discover capital-T Truth is a “science.” Mathematics does this, ergo it is a science.
Then again, others differ; Rose-Hulman describes itself as “one of the nation’s top undergraduate engineering, science, and mathematics colleges,” implicitly arguing that mathematics is not a science (and neither is engineering—which I suppose is a whole debate of its own).