Is Papua New Guinea considered an island nation?

a country whose primary territory consists of one or more islands or parts of islands. Approximately 25% of all independent countries are island countries.

Many island countries are spread over an archipelago, as is the case with Indonesia, Japan, and the Philippines-these countries consist of thousands of islands. Others consist of a single island, such as Barbados, Dominica, and Nauru; a main island and some smaller islands, such as Cuba, Iceland, and Sri Lanka; a part of an island, such as Brunei, the Dominican Republic, East Timor, and the Republic of Ireland; or one main island but also sharing borders in other islands, such as the United Kingdom (Great Britain and a part of Ireland).