There aren't four integers that can be multiplied to get 49... unless you allow the trivial case where "1" is used twice: 49 = 7 x 7 x 1 x 1
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49 multiplied by 4 is 196.
It is because a whole number multiplied by itself does not equal 15. An example of a square number is 49. 7 times 7 equals 49.
There are an infinite supply of pairs of numbers that satisfy this question. You can cut down the supply quite a bit if you restrict the answer to only whole numbers. Then there are only four pairs that do the job: 1 x 49 -1 x -49 7 x 7 -7 x -7
7x7 simple just divide by a number.