Is 18 a prime number?
Yes
No
Not sure
It depends on the context
No – 18 is not a prime number.
Why No: 18 is not a prime number because it does not meet the prime criteria of having exactly two distinct positive divisors: 1 and itself. Instead, 18 has divisors 1, 2, 3, 6, 9, and 18. Check Prime or Not
YES – 18 is a Composite Number
Why Yes: 18 is a composite number because it has more than two distinct positive divisors: 1, 2, 3, 6, 9, and itself (18).
Property | Answer |
---|---|
Is 18 a prime number? | No |
Is 18 a composite number? | Yes |
Is 18 a perfect square? | No |
Factors of 18 | 1, 2, 3, 6, 9, 18 |
Multiples of 18 | 18, 36, 54, 72, 90, 108, 126, 144, 162, 180 |
Cube Root of 18 | Not a whole number |
Square of 18 | 324 |
Square Root of 18 | 4.243 |
Is 18 a Perfect Square? | No |
Is 18 a Perfect Cube? | No |
Is 18 an Irrational number | No |
Is 18 a Rational number | Yes |
Is 18 a Real number | Yes |
Is 18 an Integer | Yes |
Is 18 a Natural number | Yes |
Is 18 a Whole number | Yes |
Is 18 an Even or odd number | Yes (18 is an even number) |
Is 18 an Ordinal number | Yes |
Is 18 a Complex number | Yes (as all real numbers are also complex numbers) |
The factors of 18 are 1, 2, 3, 6, 9, and 18. These are the numbers that divide 18 without leaving a remainder.
18 is recognized not as a prime number but as a composite number because it has divisors other than 1 and itself, specifically 1, 2, 3, 6, 9, and 18. This distinguishes it from prime numbers, which have exactly two distinct positive divisors. The number 18, in particular, may carry its own significance in specific contexts, albeit its universal cultural symbolism may not be as prominent as some other numbers. Its status as a composite number emphasizes the varied nature of numerical properties and their influence on both mathematics and cultural beliefs.
The prime factors of 18 are 2 and 3. This is because 18 can be factored into 2 x 9, and 9 can be further factored into 3 x 3. Therefore, the prime factorization of 18 is 2 x 3 x 3.
No, 18 is not a perfect square. A perfect square is a number that can be expressed as the square of an integer, and there is no integer whose square equals 18.
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Is 18 a prime number?
Yes
No
Not sure
It depends on the context
What is the smallest prime number greater than 18?
19
17
20
21
How many distinct prime factors does 18 have?
1
2
3
4
Which statement about 18 is correct?
It is a prime number because it has more than two factors.
It is a composite number because it has more than two factors.
It is both a prime and composite number.
It is a prime number because it is even.
What is the result when you divide 18 by its smallest prime factor?
3
6
9
12
What is the difference between 18 and the smallest prime number greater than it?
1
2
3
4
Which number has exactly four factors, including 1 and itself, and is greater than 18?
20
25
30
36
Which of these statements about 18 is correct?
It is both prime and composite.
It is the smallest composite number.
It is divisible by 2 and 3.
It is not a multiple of 3.
If you add the prime factors of 18, what is the result?
5
7
9
11
How can you verify that 18 is a composite number?
Check if it can be divided evenly by 1 and itself only.
Check if it is divisible by numbers other than 1 and itself.
Check if it is a single-digit number.
Check if it is an odd number.
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