Crud untuk delete gagal dan error

error pada saat mengeksekusi is_numericnya

errornya seperti ini : Fatal error: Uncaught Error: Function name must be a string in C:\xampp\htdocs\CRUD2\proses\delete.php:3 Stack trace: #0 {main} thrown in C:\xampp\htdocs\CRUD2\proses\delete.php on line 3

<?php
require_once "../config/connection.php";
if (isset($_GET['id']) && is_numeric($_GET('id'))) {

    $id = $_GET['id'];
    $cek_databse = "DELETE FROM tb_barang WHERE id_barang = $id";
    $cek_query = mysqli_query($conn,$cek_databse);
    if ($cek_query) {
        echo "<script>
        alert ('File Berhasil Delete');
    location.href = '../product-list.php';
    </script> ";
    }else {
        echo "<script>
            alert ('gagal');
        location.href = '../product-list.php';
        </script> ";
    }
}else{
    echo "<script>
            alert ('gagal');
        location.href = '../product-list.php';
        </script> ";
}

?>