prime and proper means Winnie the poo
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Prime numbers don't have proper factors.
Prime numbers, like 29, don't have proper factors.
13 is a prime number so the only factors are 1 and itself. Prime numbers have no proper factors.
You try finding a factor. If there is no proper factor, then it is a prime.
It means "draw a circle around the prime number"!It means "draw a circle around the prime number"!It means "draw a circle around the prime number"!It means "draw a circle around the prime number"!