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)
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625 has five factors.16 does, among others.
The factors of 625 are: 1, 5, 25, 125, 625
Multiply the number by .625
54 = 625 (to find out sqr rt 625 then sqr rt again)
625 is not prime. 625 = 5 * 5 * 5 * 5