What two number when multiplied equals 1991 (one thousand nine hundred ninety one)?
From the aboves multiple we can see that 1991 is a multiple of 4 numbers.
The numbers are 1, 11, 181, 1991
These numbers are called the factors of 1991.
11 x 181= 1991
A prime number is a number that is divisible only by 1 and itself (without a remainder).
1991 is not a prime number because it is divisible by other number than 1 and itself.
Lets learn factorization of other numbers.