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Just carry out the division, and see if you get an integer. It isn't worth the trouble to memorize or, worse, figure out divisibility rules for all sorts of large numbers.
Yes,because we know the divisiblity test of 2 that is last no. should be odd.
To find out if a number is divisible by 8 the number must be divisible by 2 and 4!
Adding in base 2 is binary for computers. 10 = 2 because 10 means 1 of your base. The rules are no different.