The concept of prime number and composite number It's in the math book. I forgot to take it home

Building owner,
A number with only one and its two factors is a prime number
In addition to 1 and itself, there are other numbers of factors, which are composite numbers
As like as two peas, I forgot to bring my math book, but I had to fill in the concept in my homework, and I finally found it in the oral calculation of my teacher, and it was exactly the same as that in the math book.

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