They are terms of some kind of an algebraic expression and without an equality sign it is not an equation.
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13+13+13+13+13+13+13+13+13+13 = 13 * 10 = 130.
28
13 x 13 x 13 = 2197
The square root of 13 x 13 is 13. This is because the square root of a number is a value that, when multiplied by itself, gives the original number. In this case, 13 multiplied by 13 equals 169, so the square root of 169 is 13.
13 is a prime, so its prime factorization is: 13