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It is -1 as it the opposite of the baryon number of a proton.
The opposite of doubling a number is halving it. This is also known as multiplying by 1/2 or .5 or dividing by 2.
A composite number is a number that has more divisors than 1 and itself.
False. Apart from the fact that there is no such thing as an opposite. If, by opposite, you mean negative (additive inverse), then start with a negative number. The negative of this will be positive, and so greater. If by opposite you mean the reciprocal (multiplicative inverse), start with a positive number less than one or a negative number less than -1.
Technically they are not but they are different, being the opposite subset of integers. Any integer other than 0 or 1 is either prime or composite. A prime number has only two factors which are 1 and itself. A composite number has factors that include other primes.