Square numbers have an odd number of factors.
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Yes. Square numbers have an odd number of factors. 49 has three factors.
All odd numbers have odd factors.
Odd.
The number 16 has an odd number of factors because it is a perfect square. When a number is a perfect square, it has an odd number of factors because each factor can be paired with another factor that is the square root of the number. In the case of 16, its factors are 1, 2, 4, 8, and 16, which can be paired as (1, 16), (2, 8), and (4). This results in an odd number of factors.
Because 55 is an odd number. All the factors of odd numbers are odd.