Answer
2 * $3^{2}$ * 7
Work Step by Step
126
Try to divide 126 by the first prime number 2
126 = 63 * 2
Try to divide 63 by the prime number 3
63 = 21 * 3
Try to divide 21 by the prime number 3
21 = 7 * 3
So, 126 = 2 * 3* 3 *7
Because all factors are prime, the prime factorization of 126 is
2 * 3*3*7 = 2 * $3^{2}$ * 7
