Prime factors of 1225 are 5, 5, 7, and 7.
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I would use a factor tree. 1225 245,5 49,5,5 7,7,5,5 5 x 5 x 7 x 7 = 1225
1, 5, 7, 25, 35, 49, 175, 245, 1225
The GCF of 4375 and 1225 is 175.
The GCF of 1225 and 1575 is 175
35 can be a factor, but it is not prime.