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This functions checks whether a number is, or numbers in a vector are prime numbers.
is_prime(x)
TRUE for each prime number in x, FALSE otherwise.
TRUE
x
FALSE
An integer, or a vector of integers.
is_prime(89) is_prime(15) is_prime(c(1, 2, 3, 4, 5, 6, 7, 8, 9, 10))
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