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Tests if a given number is prime and returns TRUE or FALSE
isPrime(v)
the number to be tested for primality
logical TRUE or FALSE
Tests for the primality of any positive integer using the fact that all primes except 2 and 3 can be expressed as 6k-1 or 6k+1 for integer k.
# NOT RUN { isPrime(731563) isPrime(7315631) isPrime(31**2) # }
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