This is just an arbitrary convention, based perhaps on the fact that each 'even' number can be divided into equal portions. The 'odd' numbers are not curious in any manner other than they can be only be divided into equal groups of 'odd' numbers. e.g. 15 may be divided into 5 groups of 3. BUT 7 cannot be divided into an equal number of groups.
When it is divided by any of its factors
During the five-hundreds as the Roman Empire fell, various groups from the north and east moved into former Roman lands. As they moved in, these groups created their own states. The rulers of these states, usually powerfull warlords , began to call them selves kings. These kings often fought among themselves. As a result, by the early five-hundreds Europe was divided into many small kingdoms.
Molecules, and atoms that make up molecules. An atom is made of smaller particles called protons, electrons, and neutrons. Smaller to this are groups such as fermions, Hadrons, Bosons
2 groups of 16, 4 groups of 8, 8 groups of 4, 16 groups of 2. Not really divided or in groups, but there could be 1 group of 32 or everyone by themselves.
Animalia kingdom
The groups that a kingdom are split into are: Bacteria, Archaea, Protista, Plantae, Fungi, and Animalia.
The animal kingdom is divided into smaller groups called vertebrates and invertebrates. Vertebrates are those animals with backbones and endoskeletons and invertebrates lack a backbone and generally have the skeleton on the outside of their bodies.
The organisms in each domain are sorted into smaller groups called kingdoms.
The taxonomic rank "kingdom" is divided into smaller groups called "phyla." Phyla are further subdivided into classes, then orders, families, genera, and species.
Organisms are classified into groups called kingdoms, which include Animalia (animals), Plantae (plants), Fungi (fungi), Protista (protists), Archaea (archaea), and Bacteria (bacteria). These kingdoms are further divided into phyla, classes, orders, families, genera, and species to organize and categorize the vast diversity of life on Earth.
Divided by, is like saying how many groups are there. E.g. 24 divided by 4 = how many groups of 4 are there in 24, so a smaller number would equal more groups to fit into the larger number.
A militia
Terrestrial or land environments are divided into groups called tundra, taiga, temperate deciduous forest, tropical rain
Balls now get a life
Subgroups
A group of cats is called a "clowder"! ^. .^