There are 4 significant digits
5 significant figures.
Five
1
Three.
There are 4 significant digits
5 significant figures.
4 significant figures.
8 significant figures.
3 significant figures.
Five
4
8 of them.
All of them.
One. The leading zeroes are not significant.
There are 6 significant digits in the measurement 589.040 newtons.
The significant digits are: 3701; so there are four such digits in the measurement. These are the digits that convey the degree of precision included. Leading zeroes and trailing zeroes do not add such meaning.