The number 89.
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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
The closest prime number to 100 is 101.
199
Prime numbers are not shapes. The closest thing I can think of is a polygon with a prime number of sides.
The sum of the prime factors of 6 is closest in value to the composite number 6.