A number that is not prime is called a composite number. Composite numbers can be divided up into smaller whole numbers called factors. A prime number has no factors other than one and itself.
Most integers, or counting numbers, are composite numbers. Primes are comparatively rare. All even numbers are divisible by two, so they are composite numbers. As a number grows in magnitude, the chance that it is divisible by some lesser number increases, so primes become fewer and fewer as magnitude increases. By convention, one is not considered prime. The number two is considered prime because even though it is an even number, it is only divisible by one and itself.
Learn MoreA "googolplex" is an extremely large number expressed by 1 followed by a googol of zeros. A googol is mathematically expressed as 10 to the 100th power.
Full Answer >The number "seven hundred and four thousand, six hundred and twenty" is written as 704,620 in numeric or standard form. In converting a number expressed in words to numerals, it is important to write each digit in its proper place value.
Full Answer >The number 21 has symbolic meaning in many traditions, with special significance in the Jewish and Christian Scriptures. According to The Bible Study Site, it symbolizes willful wickedness. It is closely related to the number 13, which symbolizes sin, rebellion and depravity. Adding eight, which symbolizes fullness and eternity, to 13 yields 21, representing total wickedness or an increased level of sin.
Full Answer >Phi is the 21st letter of the Greek alphabet and in mathematics, it is used as a symbol for the golden ratio. The golden ratio refers to a special number that is approximately equal to 1.618. It is also known as the golden section, golden mean, divine section, medial proportion, golden cut, extreme and mean ratio, golden number or divine proportion.
Full Answer >