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Check if element is irreducible in algebraic number field

If I have an algebraic number field

sage: S.<x> = NumberField(x^2+13)

is there a way to find out if an element is irreducible? There seems to be only a function to check if it is prime:

sage: (S(7)).is_prime()

But 7 is irreducible in $\mathbb{Q}(\sqrt{-13})$... how could I find that out?