The difference between Composite number and Semiprime
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 semiprime means a natural number that is the product of two (not necessarily distinct) prime numbers.
Semiprime is also adjective with the meaning: that has properties derived directly or by extension from a semiprime.
check bellow for the other definitions of Composite number and Semiprime
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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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Semiprime as a noun (number theory):
A natural number that is the product of two (not necessarily distinct) prime numbers.
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Semiprime as an adjective (mathematics):
That has properties derived directly or by extension from a semiprime.