Pairs of numbers.
0,1,4,16 are all factors of 60 and are perfect squares.
perfect squares
No factors of 105 are perfect squares, except ' 1 '.
Counting numbers multiplied by themselves.
Eight of them.
All numbers have factors. Some factors are perfect squares. We call these perfect square factors. 9 is a perfect square factor of 27.
Perfect squares have an odd number of factors.
Perfect squares are numbers with an odd number of factors.
A perfect square has an odd number of factors. Factors of numbers always come in pairs -- except for perfect squares. Since the square root of a perfect square is listed only once on the list of factors, it results in a list with an odd number of factors.
Only perfect squares can have an odd number of factors. The answer is 16. It has five factors: 1,2,4,8,16.
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