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Is 20 a prime number?
The factors of 20 are 1, 2, 4, 5, 10, and 20. Thus, 20 has more than two factors. Since the number of factors of 20 is more than two numbers, it is not a prime number (20 is a composite number).
Is 1 a prime number?
No, 1 is neither a prime number nor a composite number.
The only even prime number is 2. Is this true?
Yes, the only even prime number is 2.
The first five prime numbers are 2, 3, 5, 7, and 9. Is this true?
No, the first five prime numbers are 2, 3, 5, 7, and 11.
All prime numbers are odd. Is this true?
No, all prime numbers are not odd because 2 is a prime number but it is even. Interestingly, 2 is the only even prime number.
Which is the largest two-digit prime number?
Is 18 a prime number?
The given number is 18.
1, 2, 3, 6, 9, and 18 are the factors of 18. This means that 18 has more than two factors.
Since 18 has more than two factors, it is not a prime number.
Select the prime numbers from the following list: 54, 68, 97, 37
Among the given numbers, 97 and 37 are prime numbers and 54 and 68 are composite numbers.
Is the sum of two prime numbers always a prime number?
No, the sum of two prime numbers is not always a prime number. We have given example below:
3 + 7 = 10, 3 and 7 are prime numbers but not their sum 10.
Is the product of two prime numbers also a prime number?
No, because two numbers are involved in the product and it has two factors which are 1 and itself. Let’s understand with the example given below:
Example: 5 × 11 = 55, 55 has 1, itself, 5 and 11 as factors.
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