If a number is a perfect square, then you might say that one of its factors
is a factor twice, so the list of factors has an odd number of entries.
Example: 16.
Factors of 16: 1, 2, 4, 8, 16.
One of the "factor pairs" of 16 is [ 4 x 4 ], but '4' only shows up once on the list.
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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.