The official Google colors are red, blue , green and yellow . Color codes for these 4 colors are available. These are origined from the Google brand book. Google has stuck to these 4 colors since initiate in 1998 ,but has changed color slightly to use flat (two dimensions) colors to make the brand look more fashionable.
Red
PANTONE: PMS 7619 C
Hex Color: #DB4437;
RGB: (219,68,55)
CMYK: (0,78,85,12)
Blue
PANTONE: PMS 660 C
Hex Color: #4285F4;
RGB: (66,133,244)
CMYK: (88,50,0,0)
Green
PANTONE: PMS 7724 C
Hex Color: #0F9D58;
RGB: (15,157,88)
CMYK: (82,0,67,11)
Yellow
PANTONE: PMS 123 C
Hex Color: #F4B400;
RGB: (244,160,0)
CMYK: (0,20,90,0)
Colors above is from design.Google.com