Same number of decimals after the "." does not mean the same number of significant fig. (41.5821 = 6 significant fig; 0.0010 = 1 significant fig?

What does it mean that The same number of decimals after the "." does not mean the same number of significant figures. (41.5821 = 6 significant figures; 0.0010 = 1 significant figure)?

05 October 2020 9,835 3 View