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It is: 79
The first prime number after 80 is 83.
The only number that equals 80 is 80, and it's not a prime number.
To the nearest hundred: 100 To the nearest ten: 80
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.