Assume the expression is (x - 13)², and assume you want to expand it.
Note that (a - b)² = a² - 2ab + b². Then:
(x - 13)² = x² - 2(13x) + 13²
= x² - 26x + 169
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2 x 2 x 13 x 13
Prime factors: 2, 2, 2, 3, 5, 13 Other factors are combinations of the primes, i.e. 2 x 2 = 4 2 x 3 = 6 2 x 2 x 2 = 8 2 x 5 = 10 2 x 2 x 3 = 12 3 x 5 = 15 2 x 2x 5 = 20 2 x 2 x 2 x 3 = 24 2 x 13 = 26 2 x 3 x 5 = 30 3 x 13 = 39 2 x 2 x 2 x 5 = 40 2 x 2 x 13 = 52 2 x 2 x 3 x 5 = 60 5 x 13 = 65 2 x 3 x 13 = 78 2 x 2 x 2 x 13 = 104 2 x 2 x 2 x 3 x 5 = 120 2 x 5 x 13 = 130 2 x 2 x 3 x 13 = 156 3 x 5 x 13 = 195 2 x 2 x 5 x 13 = 260 2 x 2 x 2 x 3 x 13 = 312 2 x 3 x 5 x 13 = 390 2 x 2 x 2 x 5 x 13 = 520 2 x 2 x 3 x 5 x 13 = 780
13 *2 to the second power
52 = 2 x 2 x 13 OR 22 x 13
2 x 2 x 13 = 52