# 89

This number is a prime.

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Photo credit: Marsha Greer |

89 is the atomic number of Actinium, the first in the list of chemical elements alphabetically ordered. Note the appropriate use of the phrase "atomic number" which literally means "number that cannot be split." [Beedassy]

The smallest prime *p* such that the number
*"pp"* has a square of the form *"XXYY"*:
8989^{2} = 80802121. [Beedassy]

*Diaethria neglecta* is a Latin American butterfly with a prime number (89) on its underside hindwing. [Beedassy]

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