The factors of 325 are 5 x 5 x 13 x 1. 112 is 2 x 2 x 2 x 2 x 7 x 1. The only common factor between the two is 1, so they are coprime (I think relatively prime is another term, meaning the same thing).
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Yes.
It is: 13
Any number that ends with 0 or 5 is divisible by 5.
It is 13 because it is the HCF of 325 and 221
The prime factorization of 325 is: 5 × 5 × 13