Google uses four colors in its logo: blue, red, yellow and green, in that order with blue repeated. The same colors appear in product icons like Gmail, Maps and Chrome. The background is usually white so the colors stand out. The HEX codes are commonly used values, not published as an official specification.
These are commonly used reference values; they can vary by source, material or screen. Brand names and colors belong to their owners; this page only lists color codes for information.