The CAS Registry Mumber 2592-47-4 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 2,5,9 and 2 respectively; the second part has 2 digits, 4 and 7 respectively. Calculate Digit Verification of CAS Registry Number 2592-47: (6*2)+(5*5)+(4*9)+(3*2)+(2*4)+(1*7)=94 94 % 10 = 4 So 2592-47-4 is a valid CAS Registry Number.