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No, the definition of a prime is:

Any number that can only be divided by itself or 1

You say "let's take number A, and multiply it by 2" thus you can also divide it by 2 and it's therefor no Prime number

Q: Can any number apart from 1 be a prime number when doubled?

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If you consider 1 and the prime number itself as factors then: 2If you do not consider 1 and the prime number as factors then: 0A prime number is one that does not have any factors apart from 1 and itself.

No. Every even number is divisible by 1 and 2 so only 2 is prime.

74 is composite The definition of a prime number is one that is only divisible by itself and one, therefore any even number (apart from 2) cannot be a prime number

83 is a prime number and apart from itself and '1' it does not have any other factors.

91 cannot be in the prime factorization of any number because it is not a prime number itself.

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103 is a prime number and hence it does not have any factors apart from itself.

No, 194 is not a prime number because it is divisible by two, any number divisible by two is not a prime number apart from 2 itself. A prime number is a number that is only divisible by itself and one, such as 13 or 83.

If you consider 1 and the prime number itself as factors then: 2If you do not consider 1 and the prime number as factors then: 0A prime number is one that does not have any factors apart from 1 and itself.

Any even number is always divisible by 2 and thus (apart from 2 itself) all even numbers can not be prime numbers.

Any number that is not prime is composite. All even numbers (apart from 2) is 2 x some number and therefore not prime. Yes 134 is composite.

No. Every even number is divisible by 1 and 2 so only 2 is prime.

74 is composite The definition of a prime number is one that is only divisible by itself and one, therefore any even number (apart from 2) cannot be a prime number

The most important concept is that, apart from their order, the prime factorisation of any number is unique. This is known as the Fundamental Theorem of Arithmetic.

No, 154 is not a prime number. Any number that ends in 0, 2, 4, 6 or 8 is an even number, and no even number (apart from 2) is prime. Factors of 154 include 2 x 77, 11 x 14 and 7 x 22.

Any prime number is relatively prime to any other prime number.

83 is a prime number and apart from itself and '1' it does not have any other factors.

17 is a prime number and hence apart from itself it does not have any factors Factors for 51: 3 & 17