729 is not prime. 729 = 3 * 3 * 3 * 3 * 3 * 3
64 is not prime. 64 = 2 * 2 * 2 * 2 * 2 * 2
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The prime factors of 729 are 3x3x3x3x3x3 (or 36).
64, 729, 15625 and so on. Prime numbers to the 6th power.
3, 9, 27, 81, 243, 729
There isn't one. The cube root of 729 is 9, which is composite (3x3).
729 = 3x3x3x3x3x3 so 3, 9, 27, 81, and 243 will all divide into 729 evenly.