The two proper prime factors are 7 and 13.
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7 x 13
89 and 91 are both prime numbers, so when asked the prime number closest to 90, the answer is that 90 is surrounded by two prime numbers
91 is the only composite factor of 91. 7 and 13 are prime.
because it has two or more factors
They are: 7 times 13 = 91