D
25
24
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15
Prime Number
A prime number !
a prime number
169
composite number! ;)
Any composite number will do. No primes!
49 has exactly 3 factors (1, 7, and 49) and is greater than 40 and less than 60.
Any square of a prime number 13 or greater, like 169.
Any composite number. Examples: 4 and 9 . . . (three factors) 6, 8, and 10 . . . (four factors) 12 . . . (six factors) 60 . . . (twelve factors)
The answer is 25 because it has the factors 1,5,25! :)
That's a prime number.
25