Answer:
3³ · 7²
Explanation:
You want the prime factorization of 1323.
Factors
We see the sum of digits is 9, so we know 9 is a factor. Of course, 9 = 3².
1323 ÷ 3 = 441
441 ÷ 3 = 147
147 ÷ 3 = 49
We recognize this value as 7². Continuing, we have ...
49 ÷ 7 = 7
7 ÷ 7 = 1
The factors are 3·3·3·7·7 = 3³ · 7².
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