unix - How to check if a number is an integer in Pari/GP? -

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i'm trying write if statement this

 if(denominator([(i-1)! + 1] / i)-1,print(hi),print(ho))

i can integer example 10, when set i 10 gives error.

? [(x-1)! + 1] / x   ***   should integer: [(x-1)!+1]/x                                     ^-----------

i need check if [(x-1)! + 1] / x integer or not denominator thing came with, tried mod couldn't working either.

it seems confused names x , i. please, see expression below works properly:

i = 10; print([(i-1)! + 1] / i); gp > [362881/10]

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