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Take your pick! Which one do you want it to be?

75: It is the only number that is the product of three (an odd number of) prime factors.

360: It is the only number with three different prime factors.

100: It is the only number that is the product of two pairs of two prime factors.

25: It is the only number that is a square of a prime.

51: It is the only semi-prime.

4000: It is the only number that is a product of 8 prime factors.

So, given these unique characteristics, it is always possible to define a set in such a way that the stated characteristic makes that number the "odd one out".

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Q: Which number does not belong 75 360 100 25 51 4000?
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