One with one prime factor and one other factor
...or it might be one with two factors both of which are prime...
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A semiprime or a prime square.
The number 84 is interesting because it is a semiprime, meaning it is the product of two prime numbers (2 and 42). In addition, 84 is a highly composite number, having more divisors than any smaller number, with a total of 12 divisors. It is also the atomic number of polonium, a radioactive element. Furthermore, in the realm of sports, the number 84 has been worn by several famous athletes, particularly in American football.
Larger semiprime numbers are often mistaken for prime if their other factor(s) are not obvious. 40477, for instance, might appear prime at first.
A positive number. Positive Number x Positive Number = Positive Number Positive Number x Negative Number = Negative Number Negative Number x Negative Number = Positive Number
A real number which is not a rational number is an irrational number.