121 x 121
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the product of 15 and a number by its self four times.
about 31.6227766017, or 10 times the square root of 10
Well, darling, the number you're looking for is 5. You see, when you multiply 5 by itself (5 x 5), you get 25. So, there you have it, plain and simple!
The number that, when multiplied by itself, equals 15 is the square root of 15. In mathematical terms, this can be represented as √15 * √15 = 15. The square root of 15 is an irrational number, approximately equal to 3.87298.
1 and it self