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1,7,11,49,77,539
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No, it is composite. Its factors are 1, 7, 11, 49, 77, 539.
539 77,7 11,7,7
It is: 72*11 = 539
1, 2, 4, 7, 11, 14, 22, 28, 44, 49, 77, 98, 154, 196, 308, 539, 1078, 2156