Prime and Composite Numbers

Identify the odd composite number from the following.

$15, 26, 31, 37$

Identify the odd composite number from the following.

$7, 9, 12, 31$

Identify the even composite number from the following.

$15, 18, 31, 37$

Identify the even composite number from the following.

$12, 21, 19, 29$

Write down those numbers which have exactly two factors.

Is there a number which is not a factor of itself?

Which is the prime number nearest to $35$?

Write the composite numbers between $1$ and $10$.

Write the prime numbers less than $4$.

Write the prime numbers between $4$ and $10$.

Circle the prime numbers.

$12, 22, 15, 23, 17, 25, 21, 19, 20, 35$

Express $12$ as sum of the two odd prime numbers and write the smallest odd prime number as the final answer.

There are four prime numbers written in ascending order. The product of the first three is $385$ and that of the last three is $1001$. The first prime number is:

Write a pair of prime numbers whose difference is $1$.

Is $1$ a composite number?

Is $1$ a prime number ?

$28$ is a composite number.

$25$ is a prime number.

$1$ is the smallest prime number.

Since $18$ has $6$ factors, $18$ is a _____ number.