The prime numbers from 1 to 70 are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, and 67.
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173 and 179.
170
A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite. 170 is composite.
All prime numbers are rational.
There is no need to do prime factorization as prime numbers are already prime.