288. All multiples of 9 will have digits that add to a multiple of 9. To get a multiple of 9 to be all even, you need to get them to add to 18, since no set of even numbers will add up to 9. 288 is the lowest multiple of 9 to be able to add to 18. ■
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The set of even numbers contains the prime number, 2. The set of composite numbers contains infinitely many odd numbers.
no
It is not always even. * * * * * Yes. Since the numbers are even, 2 must be a common factor and so the GCF is a multiple of 2.
The sum of the first 10,000 even numbers is 100,010,000.
The sum of the first 50 even numbers is 2,550.