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In Chicago Fire Season 9 Episode 4, Chief Wallace Boden (Eamonn Walker) and Lieutenant Kelly Severide (Taylor Kinney) discover a man in an abandoned building. The unidentified male repeats the numbers, “24198.” Many viewers were left wondering what the five-digit number could mean. Here is the meaning behind the number “24198.”

A mystery man gets introduced in ‘Chicago Fire’ Season 9

The episode starts with Kelly Severide in the shower. Stella Kidd (Miranda Rae Mayo) takes notice and says his recent behavior is rather strange. Also, she questions why he doesn’t want to help her with the pending exam. Kidd fears Severide is growing distant, leaving a void between them. Chief Wallace Boden is assigned to clean an abandoned building. Severide volunteers to go with him, alarming Stella in the process. 

Meanwhile, the firehouse received an emergency call about a billboard falling on a truck, leaving the driver trapped inside. While on the scene, the driver takes a liking to Matthew Casey (Jesse Spencer) and proceeds to flirt with him. For instance, she jokingly admits to working at the strip club the billboard advertised. Ironic right?

While expecting the abandoned building, Severide and Boden discover they’re not alone. They find an unidentified man that utters the numbers, “24198.” They proceed to ask for a name, but the man repeats the numbers. So, what does the five-digits mean?

What is the true meaning behind ‘24198’?

Alberto Rosende, and Jesse Spencer standing near a fire truck in 'Chicago Fire.'
Alberto Rosende, and Jesse Spencer | Adrian S. Burrows Sr./NBC/NBCU Photo Bank via Getty Images
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As the episode progresses, Boden and Severide try to find the identity of “24198.” Soon after, they learn the man has dementia. Michele (Michele Martinez) and Desmond (Desmond Gray) transport the unidentified man to the Gaffney Chicago Medical Center. 

Concerned for the man’s safety, both men head to Chicago Med. At first, Dr. Isley (Alka Nayyar) thinks the number could be from the man’s past. But, that is not the case. Ultimately, they discover the true meaning of the mysterious five-digit number. After finding the man’s hat, Boden and Severide discover that 24198 was the man’s badge number. Shortly after, Trudy Platt (Amy Morton) says the man is a former police officer named Henry Sidwell (Peter Lawson Jones).

How to watch ‘Chicago Fire’ Season 10

For potential viewers, Chicago Fire Season 10 airs Wednesdays at 8/9 c on cable. Aside from cable, the series is available to stream live on Fubo TV. The streaming television service is available on Roku, Amazon Fire TV, Apple TV, Android TV, Samsung Smart TV, Xbox, VIZIO TV, Hisense, and LG TV. 

Additionally, the service is available on Apple and Android devices. The site offers a 7-day free trial. After that, the service will cost $65 per month for the Fubo TV’s starter pack. Also, the Chicago Fire series is available to stream on the NBC app, which is downloadable in the Google Play Store or the Apple App Store. 

Lastly, audiences can stream Chicago Fire Season 10 episodes the next day on Hulu (following its premiere date). There is a 30-day free trial for new subscribers. After that expires, the membership fee will be $12.99 a month (with no ads).

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