As you continue moving along the natural number line in the positive direction, you continue to distance yourself from 0 by greater and greater amounts, meaning there are more and more natural numbers between you and 0. Since all that it takes for a number to not be a Prime number is to have one natural number besides 1 and itself as a divisor, the more natural numbers available as potential divisors, the higher the chances of one of them actually being a divisor.
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No, prime numbers are positive integers. Decimals are not prime numbers.
Prime numbers are positive integers which can be evenly divided only by 1 and themselves. There is no other rule for all prime numbers.
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A composite number is defined as a "positive integer with a positive divisor other than one and itself". So therefore, while negative numbers can have factors in the same way as positive numbers, none is considered prime.
Only one positive prime number has a 5 in the ones digit. That prime number is 5. All other numbers with a 5 in the ones digit are composite because they will be divisible by 5.