No.
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No, 3 is a factor of both. Note that the digits of 120 add up to 3 and those of 147 add up to 12. Both are multiples of 3 so the numbers 120 s and 147 are divisible by 3 and not relatively prime
They are 3 and 7
No, it is not a prime. 147=3*7*7.
No, as 21 x 7 = 147
1,3,7,21,49,147 1, & 147 is not the only factors of 147 because 147 is not prime