There is a popular myth that Albert Einstein took an IQ test at the age of nine, but there is no credible evidence to support this claim. It is important to note that the concept of IQ tests as we understand them today did not exist during Einstein's childhood.
IQ tests, as we know them today, were developed in the early 20th century, well after Einstein's childhood. The first modern intelligence test, the Binet-Simon Scale, was developed in 1905 by Alfred Binet and Théodore Simon. Einstein was born in 1879, so it is highly unlikely that he took an IQ test during his childhood.
Additionally, even if Einstein had taken an IQ test at some point in his life, it is not possible to accurately determine his score based on the available historical information. IQ scores are relative and are interpreted based on a standardized distribution of scores. Comparing Einstein's hypothetical IQ score to those of other children his age would be speculative and not supported by factual information.
It is worth mentioning that Einstein's intellectual abilities and contributions to science are widely recognized and celebrated. However, reducing his brilliance or his achievements to a single IQ score would oversimplify the complexity of his mind and the impact of his work.