Respuesta :

kayleemit10

Answer:

21

Step-by-step explanation:

A prime number has only two factors: 1 and itself.

A composite number has more than two factors. The number 1 is neither prime nor composite.

dinomaggie

Answer:

B. 21

Step-by-step explanation:

31 is the only number that can be made by multiplying another number other than 1 and itself.

1x21=21

3x7=21

all the other options only have 2 factors

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