Divisibility
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Divisibility := If a and b are ints, then a divides b if b = a*n for some int n. a is called a factor or divisor of b. b is called a multiple of a.
shorthand a divides b is a | b i.e. divisor | multiple
(ab e Z AND b=a*n) . a | b
int p is even exactly when 2 | p
zero being even is a special case cuz zero is divisible by any int