Last updated on May 26th, 2025
Prime numbers are numbers that have only two factors: 1 and itself. They play an important role in computer algorithms, encryption, and more. In this topic, we will explore whether 1150 is a prime number or not.
Numbers can be categorized as prime or composite based on their factors.
A prime number is a natural number that is divisible only by 1 and itself.
For instance, 3 is a prime number because it has no divisors other than 1 and itself.
A composite number, on the other hand, has more than two divisors.
For example, 6 is a composite number because it is divisible by 1, 2, 3, and 6.
Some properties of prime numbers include:
Since 1150 has more than two factors, it is not a prime number.
A prime number is defined by having exactly two divisors: 1 and itself. Since 1150 has more than two factors, it is not a prime number. There are various methods to determine if a number is prime or composite, including:
The counting divisors method involves counting the number of divisors a number has to determine if it is prime or composite.
If a number has exactly 2 divisors, it is prime.
If it has more than 2, it is composite.
Let’s check whether 1150 is prime or composite:
Step 1: All numbers are divisible by 1 and themselves.
Step 2: Divide 1150 by 2. It is divisible by 2, so 2 is a factor of 1150.
Step 3: Divide 1150 by 5. It is divisible by 5, so 5 is a factor of 1150.
Step 4: Other checks up to the square root of 1150 reveal that it is also divisible by 10, 23, 46, 50, and 115.
Since 1150 has more than 2 divisors, it is a composite number.
The divisibility test method uses rules to determine if a number is divisible by another without a remainder.
Divisibility by 2: 1150 ends in 0, so it is divisible by 2.
Divisibility by 3: The sum of the digits (1+1+5+0 = 7) is not divisible by 3, so 1150 is not divisible by 3.
Divisibility by 5: 1150 ends in 0, so it is divisible by 5.
Divisibility by 7: Checking 1150 for divisibility by 7 reveals it is not divisible.
Divisibility by 11: The difference between the sum of the digits in odd positions (1+5 = 6) and the sum of the digits in even positions (1+0 = 1) is 5, not divisible by 11.
1150 is divisible by 2, 5, and several other numbers, confirming it is composite.
A prime number chart, created using the Sieve of Eratosthenes, can be used to identify prime numbers.
Step 1: List numbers from 1 to 100 in a grid.
Step 2: Leave 1 unmarked as it is neither prime nor composite.
Step 3: Mark 2 as prime and cross out all its multiples.
Step 4: Mark 3 as prime and cross out all its multiples.
Step 5: Continue this process to identify primes up to 100.
1150 does not appear in a basic prime chart and is not a prime number for it has more factors.
Prime factorization involves expressing a number as a product of prime numbers:
Step 1: Begin by dividing 1150 by 2 to get 575.
Step 2: Divide 575 by 5 to get 115.
Step 3: Further divide 115 by 5 to get 23, which is a prime number.
The prime factorization of 1150 is 2 × 5 × 5 × 23.
When learning about prime numbers, some misconceptions may arise. Here are common mistakes to watch for:
Hiralee Lalitkumar Makwana has almost two years of teaching experience. She is a number ninja as she loves numbers. Her interest in numbers can be seen in the way she cracks math puzzles and hidden patterns.
: She loves to read number jokes and games.