The difference between Composite number and Natural number
When used as nouns, composite number means a (nonzero) natural number that is expressible as the product of two (or more) natural numbers other than itself and 1, whereas natural number means a positive integer {1, 2, 3, ...}.
check bellow for the other definitions of Composite number and Natural number
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Composite number as a noun (number theory):
A (nonzero) natural number that is expressible as the product of two (or more) natural numbers other than itself and 1.
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Natural number as a noun (mathematics):
a positive integer {1, 2, 3, ...}
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Natural number as a noun (mathematics):
a non-negative integer {0, 1, 2, ...}