5 september 2025 holiday: Five is also a square pyramidal number

Five is also a square pyramidal number. Five is the only prime number to end in the digit 5 , because all other numbers written with a 5 in the ones-place under the decimal system are multiples of five . As a consequence of this, 5 is in base 10 a 1-automorphic number. The number 5 is classified as a prime number because its only factors are 1 and 5, meaning it cannot be evenly divided by any other positive integer. The number 5 is also recognized as an odd number since it cannot be divided evenly by the number 2. Learn the different ways number 5 can be represented. See the number five on a number line, five frame, ten frame, numeral, word, dice, dominoes, tally mark, fingers and picture representations. The prime factorization of 5 is 5 . Since it has only one prime factor, 5 is a prime number. Divisors of 5 1, 5 2 divisors