how to define integer size in laravel migration

When I try database migrations Scheme Builder from Laravel.

When I enter a type integer, auto_increment and primary key are automatically inputed.

I don't know how to get a create table in laravel.

Schema::create('tbl_corona_region', function(Blueprint $table){
            $table->string('seq', 30);
            $table->date('create_dt');
            $table->string('region_nm', 30);
            $table->string('region_cn', 30);
            $table->string('region_en', 30);
            $table->integer('defCnt', 15)->default(0);
            $table->integer('incDec', 15)->default(0);
            $table->integer('deathCnt', 15)->default(0);
            $table->integer('isolIngCnt', 15)->default(0);
            $table->integer('isolClearCnt', 15)->default(0);
            $table->integer('localOccCnt', 15)->default(0);
            $table->integer('overFlowCnt', 15)->default(0);
            $table->integer('qurRate', 15)->default(0);
            $table->dateTime('stdDay');
            $table->dateTime('update_dt');
            $table->primary(['seq', 'create_dt', 'region_nm']);            
        });

Generates this SQL

create table `tbl_corona_region` (
    `seq` varchar(30) not null, 
    `create_dt` date not null, 
    `region_nm` varchar(30) not null, 
    `region_cn` varchar(30) not null, 
    `region_en` varchar(30) not null, 
    `defCnt` int not null default '0' auto_increment primary key, 
    `incDec` int not null default '0' auto_increment primary key, 
    `deathCnt` int not null default '0' auto_increment primary key, 
    `isolIngCnt` int not null default '0' auto_increment primary key, 
    `isolClearCnt` int not null default '0' auto_increment primary key, 
    `localOccCnt` int not null default '0' auto_increment primary key, 
    `overFlowCnt` int not null default '0' auto_increment primary key, 
    `qurRate` int not null default '0' auto_increment primary key, 
    `stdDay` datetime not null, 
    `update_dt` datetime not null
) default character set utf8mb4 collate 'utf8mb4_unicode_ci')