Advertisements
Advertisements
प्रश्न
State if the following is a prime number?
397
Advertisements
उत्तर
A number between 100 and 200 is a prime number if it is not divisible by any prime number less than 15.
Similarly, a number between 200 and 300 is a prime number if it is not divisible by any prime number less than 20.
397 is a prime number because it is not divisible by 2, 3, 5, 7, 11, 13, 17, and 19.
APPEARS IN
संबंधित प्रश्न
Test the divisibility of the following number by 3:
79124
Test the divisibility of the following number by 10:
5790
In the following number, replace * by the smallest number to make it divisible by 9:
6702*
Write (T) for true and (F) for false against the following statement:
If a number is divisible by 4, it must be divisible by 8.
Write (T) for true and (F) for false against the following statement:
If a number divides the sum of two numbers exactly, it must exactly divide the numbers separately.
Write (T) for true and (F) for false against the following statement:
If a number is divisible by both 9 and 10, it must be divisible by 90.
Write (T) for true and (F) for false against the following statement:
If a number is divisible by 3 and 7, it must be divisible by 21.
Write (T) for true and (F) for false against the following statement:
The sum of two consecutive odd numbers is always divisible by 4.
Write (T) for true and (F) for false against the following statement:
If a number divides two numbers exactly, it must divide their sum exactly.
Which of the following divisibility rules is based on the sum of digits?
