So I was given this question
Choose any 3-digit number xyz and write it after itself as follows: xyzxyz. Check whether it is divisible by 7,11, 13. Is an arbitrary number of the form xyzxyz divisible by 7, 11, 13?
I am completely lost by this question. I seen divisibility of prime numbers and how to work with it, but I'm unsure how to apply it to this problem