Was Napoleon able to conquer Russia?

No, it was a disaster and the first great stroke to the Napoleonic Empire. The defeat cost about 570,000 men, more than 200,000 trained cavalry, artillery and transport services horses, 1,050 (out of a total of 1300) cannons. The French military power never recovered after the losses suffered in the Campaign of Russia. Furthermore., it led Austria, Prussia, Bavaria and the other German States with exception of Saxony to repeal the alliance with France, and set up the Sixth Coalition, with Russia, Great Britain, Spain, Portugal and Sweden .