What type of number is 90?
Prime number
Composite number
Neither
Both
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Is 90 a Prime Number or Composite Number [Why & Why not Detailed Guide]
Is 90 a Prime Number?
No – 90 is not a Prime Number.
Why No: 90 is not a prime number because it does not meet the prime criteria of having exactly two distinct positive divisors: 1 and itself. Check if any number is prime or not
Is 90 a Composite Number?
Yes – 90 is a Composite Number.
Why Yes: 90 is a composite number because it has more than two distinct positive divisors. It is divisible by 1, 2, 3, 5, 9, 10, 18, 30, 45, and itself (90).
Problem Statements
| Property | Answer |
|---|---|
| Is 90 a prime number? | No |
| Is 90 a composite number? | Yes |
| Is 90 a perfect square? | No |
| Factors of 90 | 1, 2, 3, 5, 9, 10, 18, 30, 45, 90 |
| Multiples of 90 | 90, 180, 270, 360, 450, 540, 630, 720, 810, 900 |
| Cube Root of 90 | 4.481 |
| Square of 90 | 8100 |
| Square Root of 90 | 9.487 |
| Is 90 a Perfect Cube? | No |
| Is 90 an Irrational number | No |
| Is 90 a Rational number | Yes |
| Is 90 a Real number | Yes |
| Is 90 an Integer | Yes |
| Is 90 a Natural number | Yes |
| Is 90 a Whole number | Yes |
| Is 90 an Even or odd number | No (90 is an even number) |
| Is 90 an Ordinal number | Yes |
| Is 90 a Complex number | Yes (as all real numbers are also complex numbers) |
What are the factors of 90?
The factors of 90 are 1, 2, 3, 5, 9, 10, 18, 30, 45, and 90. This variety of factors confirms that 90 is a composite number. Unlike a prime number, which is divisible only by 1 and itself, 90’s wide range of divisibility showcases its composite nature.
What Kind of Number is 90?
90 is categorized as a composite number because it has more than two distinct positive divisors: 1, 2, 3, 5, 9, 10, 18, 30, 45, and itself.
- 90 is an even number, distinguishing it in various numerical contexts.
- As a composite number, 90’s unique properties and wide range of factors make it a subject of interest in mathematical discussions.
- It is a natural number and a positive integer, reflecting its place in the realm of whole numbers.
- 90’s status as a rational number further categorizes it within the spectrum of real numbers, which are also considered complex numbers by definition.
Nearest Prime Number to 90
The nearest prime numbers to 90 are 89 and 97. 89 is the closest prime number less than 90, and 97 is the closest prime number greater than 90
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Practice Test
What is the smallest prime factor of 90?
2
3
5
7
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What is the sum of the factors of 90?
198
250
300
420
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Which of the following correctly describes 90?
It is a prime number
It is a composite number
It is a square number
It is a perfect cube
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If 90 is a composite number, which of the following is true?
It has only two distinct factors.
It has more than two distinct factors
It is a prime number
It is not divisible by any number other than 1 and itself
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What is the quotient when 90 is divided by its smallest prime factor?
30
45
18
15
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Which factor of 90 is also a prime number?
1
5
9
18
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What is the largest factor of 90 that is less than 20?
18
15
12
10
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Which of the following numbers is a factor of 90?
8
12
14
20
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Which statement is true about the number 90?
It is a perfect square.
It is a perfect cube.
It is a composite number.
It is a prime number.
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