exists and is an alternate of . 1 microgram is 0.000001 gram or 1 gram is 1000000 micrograms. Scroll down to related links and look at Weight and mass conversion.
Report Abuse. The major Credit cards (Visa Mastercard) almost always have 16 digits. The number will be less than 16 if the card is from a department store or gas station. CupCake Â· 8 years ago.
Originally Answered: Why does American Express (company) use a different grouping of numbers than other credit cards? Visa and Mastercard always have 16 digits whereas American Express has 15 digits. Visa and Mastercard do not issue credit cards; instead, they use banks (financial institutions) to issue the cards.