When you move from the set of integers to the set of rational numbers.
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Definition of prime number: indivisible by any number other than itself and 1. 10000000 can be divided by a whole host of numbers besides itself and 1, such as 2, 5, 10, 100, 200, 250, 500...the list goes on and on. 10000000 is most definitely NOT prime.
333 is an odd number - it is indivisible by 2. 333/2 = 166.5
As a number ending in 3, 483 is indivisible by 2, and is therefore an odd number.
256 divided by 2 divided by 2
4