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
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They are: 43+47 = 90
The number 90 is already rounded to the nearest ten.
85 is not a prime number as it is divisible by 5. Anything that ends with 5 is divisible by 5. The nearest prime number to 85 is 83 or 87.
It is 90
90