ERROR: operator does not exist: integer = integer[]

I have the following

select *
from employee AS e
where (e.id) IN (ARRAY[3,1]);

I have the following mistake
ERROR: operator does not exist: integer = integer[]
LINE 3: where (e.id) IN (ARRAY[3,1]);
^
HINT: No operator matches the given name and argument type(s). You might
need to add explicit type casts.

********** Error **********

ERROR: operator does not exist: integer = integer[]
SQL state: 42883
Hint: No operator matches the given name and argument type(s). You might
need to add explicit type casts.
Character: 45

Can anybody explain me?

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