Every multiple of any number (except 0 or 1) is composite.
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111 is a multiple of 3. Due to this, 111 is not prime and IS composite.
it is not composite it is prime
A multiple of 5 and 11 is 55
Just divide 11 into 2816 and if there is a remainder then it is not a multiple of 11 whereas in fact 2816/11 is exactly 256 so therefore it is a multiple of 11
11 is a tricky one, but this is how:if the sum of every other digit minus the sum of all the other digits equals a multiple of 11example:Q: Is 164725 divisible by 11?A: Yes. and this is why... first you take every other digit 164725, then add them 6+7+5=18. Now take the rest of the numbers 164725 and add them, 1+4+2=7. After that subtract them, 18-7=11, and 11 is a multiple of 11 (11x1=11).