7 x 13
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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.
The two proper prime factors are 7 and 13.
91 x 1 or 13 x7
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