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Do the division, if there is no remainder, then it is divisible. Seriously, the "divisibility rules" can help in some specific cases (especially division by 2, 4, 8, 5, 3, 10), but it isn't worthwhile to find divisibility rules for lots of different numbers. It becomes more complicated than doing the actual division.
12
It is divisible by 3 (3*125 = 375).
Three
Divisibility rules have been developed and refined by mathematicians over the centuries. It is difficult to attribute the invention of divisibility rules to a specific individual. However, some early rules can be traced back to ancient civilizations like the Egyptians, Babylonians, and Greeks. These rules were further expanded upon and formalized by various mathematicians throughout history.
bogo mo!