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Perfect squares have an odd number of factors.
All numbers have factors. Some factors are perfect squares. We call these perfect square factors. 9 is a perfect square factor of 27.
No. Perfect square numbers have an odd number of factors.
Perfect squares are numbers with an odd number of factors.
The perfect numbers under forty are 6 and 28.
All compound numbers that are not perfect squares.
A perfect square
perfect squares
Pairs of numbers.
A perfect square.
All nonzero numbers have factors. Some factors are even numbers, some factors are odd numbers.
Prime numbers have two factors. The sum of their proper divisors is always 1.