No, 129 is not a Prime number. A prime number is a natural number greater than 1 that cannot be formed by multiplying two smaller natural numbers. In the case of 129, it can be factored as 3 x 43, so it is not prime.
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The 4 factors of 129 are 1, 3, 43, and 129. The prime factors of 129 are 3 and 43.
129 = 3 x 43
129 is divisible by three, hence it is a composite number.
3 x 43
The numbers 83, 89, 97, 101, 103, 107, 109, 113 and 127 are prime.