If a natural number 'm' can be expressed as n2, where n is a ___ number, then 'm' is a square number.
decimal
natural
If a natural number 'm' can be expressed as n2, where n is a natural number, then 'm' is a square number.
If a natural number 'm' can be expressed as n2 where n is a decimal number, then 'm' is a square number.
In general, if a natural number m can be expressed as n2, where n is also a natural number, then m is a __________.