Magento 2 - How to retrieve product informations

In Magento 2 proposed to use service layer for this. Try use \Magento\Catalog\Model\ProductRepository::getById method to get product by id

Magento 2 recommends to use Factories for loading all Models. Here is how you should do it:

1. Above your class add this line:

   use Magento\Catalog\Model\ProductFactory;
   

2. Now create class property:

   protected $productFactory;
   

3. In your constructor, add dependency:

   public function __construct(
      ProductFactory $productFactory
   ) {
      $this->productFactory = $productFactory;
   }
   

4. Now load product as below:

   $_product = $this->productFactory->create()->load(<product_id>);
   

On top of others answers, I highly suggest using the following service contracts methods:

• \Magento\Catalog\Api\ProductRepositoryInterface::getById : to load a product by id
• \Magento\Catalog\Api\ProductRepositoryInterface::get : to load a product by sku