[Tutor] x%2

[emin]

http://www.youtube.com/watch?src_vid=QaYAOR4Jq2E&feature=iv&annotation_id=annotation_149056&v=M3g1GEkmyrw
in this tutorial what does mean x%2 ?
i think: i * 2% = always even number 
but why not 4,6 or 8? but  i * 4(6,8,10,12...)% = always even number too
for example: 100 * 2(4,6,8,10,12...)% = 2(4,6,8,10,12...)
even numbers = {2,4,6,8,10,12...}
and how pyton understanding 0(even or odd number or it is an exception?)?
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