Q: How many numbers which are less than 1000 have an odd number of factors?

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Literally every single even number less than 1000 is a composite number other than 2 which is prime.

Every second number greater than 2 is an even number.

By definition, a prime number has exactly two factors. So, there are no prime numbers with exactly three factors.

512 = 29 or 768 = 28*3 have 9 prime factors each.

Four of them.

Related questions

There are 31 numbers less than 1,000 which have an odd number of factors. They are: 1,4,9,16,25,36,49,64,81,100,121,144,169,196,225,256,289,324,361,400,441,484,529,576,625,676,729,784,841,900,961.

210 has 4, which is the maximum possible. There are other numbers with 4 different prime factors.

1000 more is 577233 1000 less is 575233

11

840

577233 and 575233 respectively

There are 12 numbers less than 150 which have an odd number of factors: 1,4,9,16,25,36,49,64,81,100,121,144.

1000 more:7735 1000 less:5735

There are four odd numbers less that 100 that have 6 factor. This does not compare with even numbers that have 12 factors!

If you take away 1000 from 503000019 you get 502999019.If you add 1000 to 503000019 you get 503001019.

The three greatest whole numbers less than 200 that each have an odd number of factors are 144, 169 and 196.

Literally every single even number less than 1000 is a composite number other than 2 which is prime.