25
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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)
It has 3 and they are 1, 5 and 25
1, 5, 25, 125
The number 25 is a composite number. The factors of 25 other than 1 and itself are prime numbers (5 X 5).
A composite number is a number that has at least 3 factors. (It can be evenly divided by at least 3 number.) 25 has 3 factors: 1, 5, and 25.