Frequently Asked Python Program 2: How To Check A Number is Prime Or Not

Topic : How To Check A Number is Prime Or Not

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[patilabhijeetj]

Good one. Just one point, if we have to check input number from user then we have to typecast input to an integer. For example, num1 is the variable storing user's input then typecast it as int(num1) and then work on this. RIght?

[merfah]

I tried this in so many ways and most of my mistakes were, like, ridiculous. Depending where you position those ifs you get errors or weird redundancies.

Thanks for the vid, helped a lot.

[joeljosh]

sir, you tell us the the program in a systematical way that is one of the main keys for understanding any program.

[hemapriyagunasekaran]

After 4 years I'm watching your videos... It helps me a lot sir...

[kasireddylaxmi]

Sir your explanation is awesome i am waiting for videos on react js sir

[elenaianachi]

I really like your courses, very well explained, thanks ! 👍👍👍

[thanushshetty]

For 0 this won't work na?
We need to use else for n<1

[daniellejdevlin]

Can you explain why number=2 shows up as prime when 2÷2=0, which would force the code to break out of loop? I know 2 is prime

[abdullahgazi]

can anyone tell this program is right or wrong fr prime number:
number = int(input("Enter number: "))
if number <= 1:
print("The number is neither prime nor Negative")
elif ((number % 2) == 0) or ((number % 3) == 0):
print("The number is not prime")
else:
print("number is prime")

[kvelez]

num = int(input("Num: "))
is_prime = True

if num > 1:
for i in range(2, num):
if num%i == 0:
is_prime = False
break
print(f"Prime number: {is_prime}")

[joeljosh]

sir can we write (n%2!=0) as condition for checking prime number

[chellaboinanarsimha]

How to find prime numbers between two numbers

[cagnkoroglu]

#%%prime number
while True:
num = int(input("your number is "))

for x in range(2, num+1):
if num % x == 0:
print("not a prime num")
break
if num % x > 0:
print("prime num")
break

[EBKCS_UTTAMSONI]

a=int(input())
if(a/1==a and a/a==1 and a%2!=0 and a%3!=0 and a%5!=0 and a%7!=0):
print(a, ":no is prime")
else:
print("no is not prime")

[swethavenkatesh]

But number 9 is a not a prime number but it's show as prime in this program

[DhrumilSoni]

# Check whether Number is Prime Or Not

num = input("Enter the Number: ")

# prime Number-
# Number > 1
# Only 2 factors - 1 and Number itself.

# 19 = 1, 19
# 28 = 1, 2, 4, 7, 14, 28
count = 0

if int(num) > 1:
for i in range(1, int(num)+1):
if int(num) % i == 0:
count += 1
if count == 2:
print("Number is Prime")
else:
print("Number is not Prime")
else:
print("Number is not Prime number")

# This will handle input 1 as well.

[mmnpyxm]

i want your guidance for getting job can i get your number sir...