Question

2. Which of the following proves that 209 is NOT a prime number?

a) 209 × 1 = 209
b) 19 × 11 = 209
c) 209 is an odd number
d) 209 is not visible by 2,3,5 and 7.

Answer 1

the answer is B) 19 × 11 = 209

coz A prime number is a whole number greater than 1 whose only factors are 1 and itself.

but here it is a multiple of 11 and 19 ....

so its proved