2, 4, 6
All even numbers have even multiples.
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The multiples of all odd numbers are odd and even. Odd x odd = odd. Odd x even = even. Since odd and even numbers alternate, the multiples will alternate as well.
Because it's not even. Multiples of 6 have to also be multiples of two, that is, even numbers.
The set of even natural numbers which are multiples of 3 is an empty set. This is because even numbers are divisible by 2, while multiples of 3 are not divisible by 2. Therefore, there are no numbers that satisfy both conditions simultaneously.
Any even exponent of 3 is a square number.
The first 50 multiples of 6 are the first fifty even multiples of 3.