Any of these pairs of primes give 90:
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It is not possible to multiply two prime numbers and get 90. You can add 43 and 47.
It is impossible to write 90 as the product of two prime factors. 90 is equal to 2 x 32 x 5.
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
As a product of its prime factors: 233*5 = 90
37 and 53 = 90