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
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21
your answer is 3 147 * 3 = 441 21 * 21 = 441
You are talking about perfect square numbers (the product of a number multiplied by itself. Please see related link with a bit more information
3*3*7*7 = 441
It is: 3*3*7*7 = 441