Yes, it has nine factors: 1, 3, 5, 9, 15, 25, 45, 75, 225.
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An even number can be divided by 2 evenly. An odd number will have a remainder of 1 when divided by 2. 225 is an odd number.
225
Yes. Square numbers have an odd number of factors. 49 has three factors.
Square numbers have an odd number of factors.
All odd numbers have odd factors.