For 25, 1 and 25
For 49, 1 and 49
For 64, 1, 4, 16 and 64
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25, 49, 81 To satisfy your criterion, you need the square of an odd number.
16 has an odd number of factors; its factors are 1, 2, 4, 8, and 16
Square numbers like 1, 4, 9, 16, 25, 36, 49, 64, 81, 100
There are 10 numbers less than 101 which have an odd number of factors: 1,4,9,16,25,36,49,64,81,100.
The factors of 49 are 1, 7, 49. The factors of 25 are 1, 5, 25. The GCF of 49 and 25 is 1.