• → EvenQ

CoprimeQ

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CoprimeQ[x, y]

tests whether x and y are coprime by computing their greatest common divisor.

• • CoprimeQ[7, 9]

• • CoprimeQ[-4, 9]

• • CoprimeQ[12, 15]

For more than two arguments, CoprimeQ checks if any pair or arguments are coprime:

• • CoprimeQ[2, 3, 5]

In this case, since 2 divides 4, the result is False:

• • CoprimeQ[2, 4, 5]