No, it is composite.
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189 = 33 × 7
The prime numbers (factors) of 189 are: 3 and 7
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.
They are: 333*7 = 189
160 and 189 are relatively prime as they have no common factors other than 1.