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36 and 100, among others.
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To have an odd number of factors, one of them must be repeated, which means the number must be a perfect square.
In the prime factorisation of a perfect square in power format, every power of a prime is an even number.
To find the number of factors of a number, add one to the powers of all the primes in the number's prime factorisation and multiply them together.
Thus all numbers of the form p^8 or p²q² where p and q are different primes have 9 factors.
so 2^8 = 256, 3^8 = 6561, 5^8 = 390625, ... all have 9 factors, as do:
2²3² = 36, 2²5² = 100, 2²7² = 196, 3²5² = 225, 3²,7² = 441, ...
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The number four has three factors What is the next number with exactly three factors?
The number 9: factors are 9, 3, and 1.
What is the largest one digit number that has 3 factors?
The largest one digit number that has three factors is 9. Its factors are 1, 3, and 9.
How many factors does the number 9 have?
9 has three factors: 1, 3, and 9.
The number 9 has three different factors the number 10 has how many different factors?
Four
What odd number has 3 factors?
Well, honey, an odd number with only 3 factors is like finding a unicorn at the grocery store - rare but not impossible. The number you're looking for is 9. It's odd, and its factors are 1, 3, and 9. Voilà!
