It is: 73 = 343
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7 exponent 3 = 343
That means that you use the number 7 three times as a factor, like this: 7 x 7 x 7.
Use a factor tree. 343 49,7 7,7,7
343 is not prime. 343 = 7 * 7 * 7
3, 4, 5, 6, 7, 9, 16, 25, 27, 36, 49, 64, 81, 125, 216, 256, 343, 625, 1296 or 2401 (assuming the "between" is inclusive).