625 = 5^4 Why? Let do it step by step:
625 = 5 x 125
625 = 5 x 5 x 25
625 = 5 x 5 x 5 x 5
5 x 5 x 5 x 5 = 625
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5 x 5 x 5 x 5 = 625
625 = 5 x 5 x 5 x 5
write the prime factorization of 625
625 is not prime. 625 = 5 * 5 * 5 * 5