Any odd square number.
9 has 1, 3 and 9
25 has 1, 5 ans 25
49 has 1, 7 and 49
81 has, 1, 3, 27, 9 and 81
121 has 1, 11 and 121 etc.
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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.
Odd.
Because 55 is an odd number. All the factors of odd numbers are odd.