No, they can be divided.
For example, 3 is a Prime number because its only factors are 1 and 3.
80 is a prime number because it can be divided by 1, 2, 4, 8, 10, etc.
189 can be divided by 1, 3, 63, etc.
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The prime numbers (factors) of 189 are: 3 and 7
The prime numbers (factors) of 80 are: 2 and 5
Prime numbers between 71 to 80 = 73 and 79 Therefore there are 2 prime numbers between 71 to 80.
181 + 5 + 3
The numbers 83, 89 and 97 are prime.