Identification of Prime Number

14/05/2019 0 0

Step (i) : Find approximate square root of given number
Step (ii): Divide the given number by prime numbers less then approximately square root of number. If given number is not number, then it is prime otherwise not .

Ex.1. Is 131 a prime number?

Sol. Approximate square root = 12

Prime number < 12 are 2, 3, 5, 7, 11 But 131 is not divisible by any of these prime number. So 131 is a prime number.

0 Like 0 Dislike

Follow 1

Other Lessons for You

Numbers 2

Whole number can not be a Natural Number because whole number starts from 0 while Natural number starts from 1 which des not includes zero as it not include zero so it can not be a whole number. Natural...

Kanika

1 0

NUMBER SYSTEM

NUMBER A mathematical symbol represented by a set of digits is called a number.we can express a number in two, i.e., in words & in figures.e.g., if a number is 3290, then we can write this number...

Deepa Thakur Sharma

2 0

Composite Numbers

Natural numbers having more than two factors are called Composite numbers. 4, 6, 8, 9, 10, 12, 14, 15, 16, 18… are composite numbers. Number 1 is neither prime nor composite number. All even...

Arvind Kumar

0 0

Find Class 9 Tuition near you

Online Class 9 Tutor

Looking for Class 9 Tuition ?

Learn from Best Tutors on UrbanPro.

Are you a Tutor or Training Institute?

Join UrbanPro Today to find students near you

Looking for Class 9 Tuition Classes?

The best tutors for Class 9 Tuition Classes are on UrbanPro

Select the best Tutor
Book & Attend a Free Demo
Pay and start Learning

Take Class 9 Tuition with the Best Tutors

The best Tutors for Class 9 Tuition Classes are on UrbanPro

UrbanPro.com is India's largest network of most trusted tutors and institutes. Over 55 lakh students rely on UrbanPro.com, to fulfill their learning requirements across 1,000+ categories. Using UrbanPro.com, parents, and students can compare multiple Tutors and Institutes and choose the one that best suits their requirements. More than 7.5 lakh verified Tutors and Institutes are helping millions of students every day and growing their tutoring business on UrbanPro.com. Whether you are looking for a tutor to learn mathematics, a German language trainer to brush up your German language skills or an institute to upgrade your IT skills, we have got the best selection of Tutors and Training Institutes for you. Read more

I am a Student I am a Tutor
Name*	Please enter your full name. Please enter institute name.
Email*	Please enter your email address.
Phone*	Please enter a valid phone number.
Location*	Please enter a pincode or area name.
City*	Please enter city name.
Category*	Please enter category.
Gender*	Male Female Please select your gender.
Email ID/ Mobile No.*	Please enter either mobile no. or email.
Enter Password*	Please enter OTP Please enter Password Sorry, this phone number is not verified, Please login with your email Id.