While you can remove the SKU from the front-end of store product pages with some CSS, I always prefer to remove this with a quick filter:
// remove skus from product page front end
function pro_remove_product_page_skus( $enabled ) {
if ( ! is_admin() && is_product() ) {
return false;
}
return $enabled;
}
add_filter( 'wc_product_sku_enabled', 'pro_remove_product_page_skus' );