It's an odd number so it obviously can't be divided by 2.
The sum of its digits (1+6+5) is a multiple of 3, so the number itself is a multiple of 3.
So it's not prime.
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No, 144 and 165 are not relatively prime. For them to be relatively prime, the number 1 could be their only common factor, but they also have 3 as a common factor.
No, 54 and 165 are not relatively prime.
The prime factors of 165 are 3,5,and 11.3, 5 and 11