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Q: What is the largest composite number that is less than 400?
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What is the largest composite number less than 5?

4 is a composite number (2 x 2), and it is less than 5.


What is the largest composite number less than 100?

99 is the largest composite number less than 100: its prime factorisation is 3 x 3 x 11


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The largest single digit composite number is 9. The largest prime number is 17 million digits long. The definition of a composite number is any number that has at least one positive divisor other than one or the number itself (it is not a prime number). The largest composite digit is therefore longer than the largest prime number by at leaf +1.


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