8.25
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625 = (6 x 100) + (2 x 10) + (5 x 1)
1 x 625, 5 x 125, 25 x 25, 125 x 5, 625 x 1 = 625
The prime factor of 625 is 5.
625 = 5^4 Why? Let do it step by step:625 = 5 x 125625 = 5 x 5 x 25625 = 5 x 5 x 5 x 55 x 5 x 5 x 5 = 625
Identify the prime factors of 625 which are : 5 x 5 x 5 x 5 = 625. The factors of 625 are therefore 1 x 625, 5 x 125 and 25 x 25. As the number 25 is effectively duplicated then 625 has 5 factors (1, 5, 25, 125 & 625)