Names of 1998
| Nominal | 1998 |
| Cardinal | one thousand nine hundred ninety-eight |
| Ordinal | 1,998th |
| This number as US currency | one thousand nine hundred ninety-eight dollars |
| Is 1998 an odd number? | 1998 is NOT an odd number |
| Is 1998 an even number? | 1998 is an even number |
| Is 1998 a palindrome? | 1998 is NOT a palindrome number |
| Is 1998 a triangle number? | 1998 is NOT a triangle number |
1998 in other Bases
| Base 2 (Binary) | 111110011102 |
| Base 3 (Ternary) | 22020003 |
| Base 4 (Quaternary) | 1330324 |
| Base 5 (Quinary) | 304435 |
| Base 6 (Senary) | 131306 |
| Base 8 (Octal) | 37168 |
| Base 12 (Duodecimal) | 11A612 |
| Base 16 (Hexadecimal) | 7CE16 |
| Base 20 (Vigesimal) | 4JI20 |
Primes and Factors tests for 1998
| Is 1998 a Prime Number? | 1998 is NOT a prime |
| Is 1998 a perfect number? | 1998 is NOT a perfect number |
| Is 1998 a Mersenne Prime? | 1998 is NOT a Mersenne prime |
| Is 1998 a Fermat Prime? | 1998 is NOT a Fermat prime |
| Is 1998 a Fibonacci Prime? | 1998 is NOT a Fibonacci prime |
| Is 1998 a Partition Prime? | 1998 is NOT a Partition prime |
| Is 1998 a Pell Prime? | 1998 is NOT a Pell prime |
| Prime Factors | Prime factors of 1998 |
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1998 in other Numerals
| 1998 in Roman Numeral | MCMXCVIII |
| 1998 in Chinese Numeral | 壹仟玖佰玖拾捌 |
| 1998 in Egyptian Numeral | 𓆼𓍪𓎎𓐁 |
| 1998 in Babylonian Numeral |   |
Roots and stuff for 1998
| Is 1998 a square number? | 1998 is NOT a square number |
| Is 1998 a cube number? | 1998 is NOT a cube number |
| Square root of the number 1998 | 44.698993277254 |
| Cube root of the number 1998 | 12.595009361425 |
Recreational math for 1998
| Number 1998 reversed | 8991 |
| Sum of the digits | 27 |
| No of digits | 4 |