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729 is composite because it has 7 factors: 1, 3, 9, 27, 81, 243, and 729.
The square root of 729 is 27 and as a product of its prime factors in exponents it is 36
Composite; its factors are 1, 3, 9, 27, 81, 243, 729
36 = 729
3, 9, 27, 81, 243, 729