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Easiest way of finding a number whether it is prime or not is prime factorization.
73 is prime number.
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u have to verify
it is a long procces
i will let u know the answer by evining
no need i dont want......
73 is a prime number because it can only be  divided evenly by 1 and itself.

You know that except number 2 all other even numbers are not prime numbers. You also know  except number 5, all other numbers divisible by 5 are not primes.You  can also find it by dividing or by primefactorisation. 

I hope my answer helped.! :)
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