1, 3, 5, 9, 15, 45.
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Square numbers have an odd number of factors. 1, 4, 9, 16...
The most factors any odd number less than 100 has is 6. There are 4 numbers which have 6 factors:45, 63, 75 & 99.
Yes, it has nine factors: 1, 3, 5, 9, 15, 25, 45, 75, 225.
odd
Yes. Square numbers have an odd number of factors. 49 has three factors.