Two distinct prime factors, six total prime factors.
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The prime factorization of 400 is 2x2x2x2x5x5 (or 24 x 52 in exponential form).
The last prime before 400 is 397.The prime factorization of 400 is 2x2x2x2x5x5.
400 200,2 100,2,2 50,2,2,2 25,2,2,2,2 5,5,2,2,2,2
10 squared times 2squared
2 to the 4th times 5 squared