this link http/ark.intel.com/products/76621/Intel-Pentium-Processor-3556U-2M-Cache-1_70-GHz does not show if it the socket version which means your cpu is most likely soldered to the motherboard itself thereby not upgradeable.
http/www.intel.co.uk/buy/uk/en/product/laptops/acer-aspire-e5-573-p8zc-494216/technical-specifications