Which of the following is not a prime number?
A
233
B
251
C
241
D
259
Correct Answer: 259
162 > 233,251,241,237 Prime numbers less than 16 are 2,3,5,7,11,13 233, 251 and 241 are not divisible by any of the above numbers. Hence these are prime numbers. But, 259 is divisible by 7. Hence, it is not a prime number.