A Prime number is an integer that can not be written as a product of two or more integers.
For instance:
6 = 2 x 3, so it is not a prime number.
27 = 9 x 3, so it is not a prime number
105 = 5 x 21 = 3 x 5 x 7, so it is not a prime number
23 can not be written as a product of integers, so it is a prime number.
All even numbers are prime numbers, because they can be written as multiple of 2.
61 is a prime number, 62 is not, 63 is not, 64 is not, 65 is not, 66 is not, 67 is, etc...
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97 is the largest prime number below 100.
ANSWER: The next prime number after 80 is 83.
A prime number has no other factors except itself and 1. There are three numbers between 80 and 100 that are prime: 83, 89 and 97.
The prime numbers between 80 and 100 are 83, 89, and 97.83 89 97.