Any numbers that are not multiples of three.
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Prime numbers are not divisible by any numbers other than themselves and 1.
The list of numbers that are divisible by three is infinite. The first four are: 3, 6, 9, 12 . . .
There are 2,966 numbers between 100 and 9,000 that are divisible by three.
The quotient of 180/3 is 60. So yes it is divisible by three. All numbers are divisible by three, but division is not a closed operation until you use the rational numbers.
Even numbers are divisible by 2. Even numbers that are divisible by 3 must be divisible by 2 and by 3, so they have to be divisible by 2 x 3.6, 12, 18, 24 …