Is a number easier to read with the thousand separator?

Thousands Separator Commas In English, you can use commas in numbers of four digits or longer (i.e., numbers above 999) after every third digit from the right. These “thousands separators” make it easier to read long numbers since we can see where the different groups of digits fall at a glance.

1. What does thousands separator mean?
2. Do the UK use commas instead of decimal points?

What does thousands separator mean?

In European languages, large numbers are read in groups of thousands, and the delimiter – which occurs every three digits when it is used – may be called a "thousands separator".

Do the UK use commas instead of decimal points?

Great Britain and the United States are two of the few places in the world that use a period to indicate the decimal place. Many other countries use a comma instead. The decimal separator is also called the radix character.