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Any number can be multiplied to get the answer 441. For example 5 can be multiplied by 88.2 If the question was which number can be multiplied by itself, the answers are: -21 and +21
It is: 21*21 = 441
3*3*7*7 = 441
As a product of its prime factors: 3*3*7*7 = 441
1 x 3 x 3 x 7 x 7