128
64,2
32,2,2
16,2,2,2
8,2,2,2,2
4,2,2,2,2,2
2,2,2,2,2,2,2
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No: 105 and 128 are both composite numbers because they have more than two factors
128 64,2 32,2,2 16,2,2,2 8,2,2,2,2 4,2,2,2,2,2 2,2,2,2,2,2,2
128 = 27. You can find out this sort of things quickly if you take the trouble to divide the number into prime factors.
The positive integer factors of 2176 are: 1, 2, 4, 8, 16, 17, 32, 34, 64, 68, 128, 136, 272, 544, 1088, 2176 The prime factors of 2176 are: 2, 17
(Prime factors in bold):1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 64, 80, 100, 128, 160, 200, 320, 400, 640, 800, 1600, 3200.