It is 2 because the prime numbers of 86 are 2 and 43
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97 - 11 = 86
No 86 is not a prime number because it has more factors than 1 and itself, for example it has the factors 1, 2, 43, and itself: 86.
The least prime number is 2.
The answer depends on the degree of rounding, but the least number is: 43000 to the nearest 86 thousand.
It could be 97 which is a prime number.