Question

It is required to decide if 1107 is a prime number

Answer 1

Numbers

Given: the number 1107

To find: to decide if 1107 is a prime number

Solution:

• We must know that when the sum of the digits of a number is divisible by 3, the number also is divisible by 3.

• The given number is 1107

• Sum of its digits = 1 + 1 + 0 + 7 = 9, divisible by 3.

• So the number 1107 is also divisible by 3.

• 1107 = 3 × 3 × 3 × 41

Answer: 1107 is not a prime number.