If it's a whole number, and those are its only factors, then it's a 'Prime number'.
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Factors multiply. 1 and 41 are the only ones that make 41.
1 has one factor: itself.11 has two factors: one and itself.
Each prime number has only two factors which are itself and one.
it has two. 3 times 1 and 1 times 33 is a prime number which means it has only two factors which are itself and one
They are 1 and 17 because 17 is a prime number which has only two factors