Q:
# Is 19 a prime number?

**The number 19 is the eighth prime number.** A prime number is a positive, whole number that is only divisible by one and itself. Nineteen is also the seventh Mersenne prime exponent, which is a prime number that is one less than a power of two.

Out of the first 100 numbers, 25 of them are prime numbers. The opposite of a prime number is a composite number. Because all even numbers are divisible by two, the number two is the only even prime number. Similarly, no prime numbers that are higher than five end in five. One is a unique number because it is neither a prime number nor a composite number.

Learn more about Numbers-
Q:
## How do you write a number in scientific notation?

A: To write a number in scientific notation form, write the digits of the original number with a decimal point after the first digit. Then write a multiplicat... Full Answer >Filed Under: -
Q:
## What is 47 in Roman numerals?

A: The Roman numeral equivalent of the number 47 is XLVII. The Roman numeral system uses letters and combinations of letter to represent numbers. The basic Ro... Full Answer >Filed Under: -
Q:
## Select the next number in the series: 16, 26, 21, 31, __?

A: The next logical number in the series comprised of 16, 26, 21, 31, __ is 26. The difference between 16 and 26 is 10, the difference between 26 and 21 is -5... Full Answer >Filed Under: -
Q:
## What is a composite number?

A: A composite number is a positive whole number that can be divided evenly by a number other than itself and one. For example, 12 is a composite number, as i... Full Answer >Filed Under: