[tourist2d]

If number end in 2 or 5, is divisible by 2 or 5. So number ending in 2 or 5 cannot be prime. Math no hard to understand!

[BSEdlMMldESB]

but this is only because 10 in ten in decimal system

but the numbers are not (only) how they're written down!

meh...

[nh23423fefe]

Everything you've written is gibberish in spanish, why did you do that?

[BSEdlMMldESB]

cuz it happens to be the first spoken language I learned?

does this answer your question? if not, maybe this can help: https://www.youtube.com/watch?v=BdOtR2A5agc