Linux refers to these settings as system-locale.
You can change your system locale by,
- set environment variables to control the system locale. You can set these variables to be system-wide, or on a per-session basis:
LC_ALL
Overrides all LC_* environment variables with the given value
LC_CTYPE
Character classification and case conversion
LC_COLLATE
Collation (sort) order
LC_TIME
Date and time formats
LC_NUMERIC
Non-monetary numeric formats
LC_MONETARY
Monetary formats
LC_MEASUREMENT
Measurement units (Metric or Other)
LANG
The default value, which is used when either LC_ALL is not set, or an applicable value for LC_* is not set
TZ
Time zone
You can use the command locale to show your current locale.
locale -a displays all the locales that are currently installed on the machine. Make sure that the locale you select for LANG and LC_ALL is in the list that is returned by the command locale -a. The values that locale uses and returns are case sensitive, therefore copy them exactly when assigning them to an environment variable.
Consult the man-pages for more information like given below
Spefically for what you asked for, set
mon_grouping: Defines the size of each group of digits in formatted monetary  quantities.
        mon_grouping   Formatted Value  ISO C String
         3;-1       123456'789       "\3\177"
         3          123'456'789      "\3"
         3;2;-1         1234'56'789      "\3\2\177"
         3;2        12'34'56'789     "\3\2"
         -1         1234567898       "\177"
Therefore your case should be 
in LC_MONETARY
mon_grouping           -1
and also in LC_NUMERIC
grouping                -1
EDIT: To change these settings, edit your locale config file
/usr/share/i18n/locales/<your_locale>