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91 is the only composite factor of 91. 7 and 13 are prime.
91 = 13 x 7 Can't go any further as both 13 and 7 are prime numbers.
They are: 7 times 13 = 91
The product of the fourth and sixth prime numbers is 91.
Of the numbers in your question, three are prime, and one is composite. The three prime numbers are 13, 37, and 101, and the composite number is 91. 91 is equal to 13 x 7.