1998 (54x37)
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Last prime of the 20th Century was 1999. Last prime of the 21st Century will be 2099.
It is in the 20th century.
During the 20th century.
1910 is 20th century Century=1st two digits of year +1
the 20th century started in 1901. The first full 1900 years (19 centuries) included 1900, because there was no year 0.