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A prime number is any whole number that is only divisible by itself and one. The first ten prime numbers are 1, 2, 3, 5, 7, 11, 13, 17, 19, and 23. The only even prime number is the number 2.

Only if you want to, and it's not illegal.

If you mean Puerto Rico, no, it is not a state. Rather, it is an unincorporated territory with commonweath status in the United States. The US gained control of Puerto Rico, along with Cuba, Guam, and the Philippines when Spain conceded control of these areas at the end of the Spanish-American War. Puerto Rico has undergone many changes in its government over the years; however, Puerto Rican citizens do have US citizenship.

In the United States, Earth Day is celebrated on April 22 each year. This is different from International Earth Day, which is celebrated on the vernal equinox (which can vary, but usually falls between March 20 and March 22).