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PrimeQ

Tests whether an integer is prime.

$ wo 'PrimeQ[7]'
True

$ wo 'PrimeQ[8]'
False

A complex argument is tested for Gaussian primality, and GaussianIntegers -> True applies the Gaussian test to a real integer.

$ wo 'PrimeQ[1 + I]'
True

$ wo 'PrimeQ[5, GaussianIntegers -> True]'
False