The CAS Registry Mumber 98186-14-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,8,1,8 and 6 respectively; the second part has 2 digits, 1 and 4 respectively. Calculate Digit Verification of CAS Registry Number 98186-14: (7*9)+(6*8)+(5*1)+(4*8)+(3*6)+(2*1)+(1*4)=172 172 % 10 = 2 So 98186-14-2 is a valid CAS Registry Number.