If the number is even, it is divisible by 2.
If the sum of the digits is a multiple of 3, the whole number is divisible by 3.
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Three
Any multiple of two must end in 0, 2, 4, 6 or 8.
12
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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.